diff --git a/2015/01/input b/2015/01/input
new file mode 100644
index 0000000..73e014e
--- /dev/null
+++ b/2015/01/input
@@ -0,0 +1 @@
+(((())))()((((((((())()(()))(()((((()(()(((()((()((()(()()()()()))(((()(()((((((((((())(()()((())()(((())))()(()(()((()(()))(()()()()((()((()(((()()(((((((()()())()((((()()(((((()(())()(())((())()()))()(((((((())(()())(()(((())(()))((())))(()((()())))()())((((())))(()(((((()(())(((()()((()((()((((((((((())(()())))))()))())()()((((()()()()()()((((((())())(((()())()((()()(((()()()))(((((()))(((()(()()()(()(()(((())()))(()(((()((())()(()())())))((()()()(()()(((()))(((()((((()(((((()()(()())((()())())(()((((((()(()()))((((()))))())((())()()((()(()))))((((((((()))(()()(((())())(())()((()()()()((()((()((()()(((())))(()((())()((((((((()((()(()()(((())())())))(())())))()((((()))))))())))()()))()())((()())()((()()()))(()()(((()(())((((())())((((((((()()()()())))()()()((((()()))))))()((((()(((()))(()()())))((()()(((()))()()())())(((())((()()(())()()()(((())))))()())((()))()))((())()()())()())()()(()))())))())()))(())((()(())))(()(())(()))))(()(())())(()(())(()(()))))((()())()))()((((()()))))())))()()())((())()((()()()))()(((()(()))))(())()()))(((()())))))))))(((())))()))())()))))()()(((())))))))()(()()(()))((()))))((())))((()((())))())))()()(()))())()(()((()())(()(()()())())(()()))()))))(()())()()))()()()()))(()(()(()))))))()(()))()))()()(()((())(()(())))()(((())(())())))))()(()(()))))()))(()()()(())()(()(())))()))))()()(((((())))))())()())())())()())()))))()))))))))())()()()()()()())))()))((())()))())))()((())()))))()))())))))))())()()()))()()(()((((()(((((((()(())((()())((()()))()))))(())))()()()(())((())()())))(())))(())))(((()()))()(())(((()(()))((())))())()))((((()))())()))))))))()(())())))(()))()(()()))())()()(())())))())()()(()())))()((()())(()(())(())))))))))))))(()))))()))))))()()())(()(((((()(()())))())()))(()))()))(()()))()())(()))())()(())((()()))))))())))())()(((())))(()(()))()()))()(()))))))((()())(()))))))()())))()()))))))))((((((((()()()(()))))))()())))())))()()((())()))((())(())))())())))()()()((()((()(())))())()(())))))))))()())))()()()()()()))()))((())())(()(()))))))(()()))()))(())))()))))))))))))(()))))))))()))))()))()())()))()()))))))()))))((()))))(()))())()(())))(()())((((()())))()))))(()))()(()()(())))))())))))()))))))())))())))))())))())())))())(()))))(())()(())))())()))((()()))))))())))((())))))))())))(())))))()()())))))())))))()))))))()))()()()(()(((()())())())(()))())))))((()(())(()))))))))(())))()()()())())(()))))()()()))()))())())())()(())))()(((()((((())))))))()))))))))))))))))))))((())()())(()))))()()))))))(()()(())())))())))((())))((())))))))))))))()))))()(()))))))())))))()))(()()())(()())))))))))()))))))(())))))()()))()())(((())))()))(()))))))))(())())))())))())())())()()))((())()(())()())()))()())(())(()))))()())))(()(((()))))))()(()())()()()))()))))))))()()()(())()())()(((((()))()())())(()))))()()()(())))())))()((()())))(()))())()(()())())(()))()()))((()()))((()()()()())))(())()))(()(())))((()()))))))))())))))))())()()))))))))))))))))(())()(())(())()())())()))()(()))))())())))))()())()(()))()()(())))(())())))))(()))))))))))))))())())(())(())))(((()))()))))())((())(()))())))))))())))))())))()))()))))))))))))())()))))()))))((()))(())))()(())))(())()))()))())))())))))))()(()())())))()()())))(())))))(()))))))))))))(()))()))()))())))(((()()()(())((()())))()())(((()))(())()))((()()()())))())(())(()))))()(((((())))(()))())())))))))((((()()()))())())()(()(()())))))))))()())())))(())))()())(((()(())())()()))())())))))))((()())((()()(()))(()(())))()))()))(()))(()))()()(()(((())((((()))()(()))((())()(()(()())()(()))()())))))(()))()))())()())))())))(())))((())(()())))))()))(())(()))()())()(()()((()(()))))))()(())(()())(())()))(((())()))(()()(()()()))))(()(())))()))))())))))())(()()()()()()(((())))(()()))()((())(((((()()())))(()))(()))()()))(((())())()(((()()()()))))(()))(())())))()())(()()())())))))))()))))((())))()())(()))(()(()))())))))())(())))))()()())())()))()()(())))(()))(())((((((())(()))(()))())()))(()()(())))()))(()()))()))()(())))(())))((()(()))(())()()())())))(((()()())(())()))))))()(((()(((((()()(((())(())))())()((()))))((()())()(())(((())))(((()((()(()(()))(()()))())(()))(())(())))()))))))((((()))()((((()(()))()))()()))))()(()(()))()(()((()(((()(()()(((()))))()(((()(()(()(((()(()())())()()(()(()())())(()((((())(()))()))(((((()()())(())()((()()())))()()(((()()))()((((((((()(())))())((()))))(())))(()))))((()((((()()(())(((((()))(((((((((((((()())))((((()(((()((())())()))((()))()(()()((()()()()(()()(()(()(((())()(()((((((()((()()((())()((((()((()()(()()())((()()()((()((())()(()(((()((())((((())(()))((()(()))(()())()((((((((()(((((((((((()))(()(((()(()()()((((())((())()())()))(())((())(()))(((()((()(())))(()))))((()()))))((((()(()(()())(()(())((((((((()((((()((()(((((()))())()(()))(()()((()(())(((((()(())()(((((()()))))))()(((())()(()()((((())()((())((()(((())(((()))((()()((((()(())))))((()((((()((()((()(((())((()))(((((((()(((()((((((((())()))((((())(((((()((((((((()(((()((()(((()()(((()((((((()()(()((((((((()()(()(()(())((((()())()))))(((()))((((())((((()())((()(())()((()((((((()(((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\ No newline at end of file
diff --git a/2015/01/part01.py b/2015/01/part01.py
new file mode 100644
index 0000000..905af06
--- /dev/null
+++ b/2015/01/part01.py
@@ -0,0 +1,12 @@
+with open("input") as f:
+    puzzle_input = f.read()
+
+solution = 0
+
+for char in puzzle_input:
+    if char == "(":
+        solution += 1
+    else:
+        solution -= 1
+
+print(solution)
diff --git a/2015/01/part02.py b/2015/01/part02.py
new file mode 100644
index 0000000..c829214
--- /dev/null
+++ b/2015/01/part02.py
@@ -0,0 +1,18 @@
+with open("input") as f:
+    puzzle_input = f.read()
+
+floor = 0
+position = 1
+
+for char in puzzle_input:
+    if char == "(":
+        floor += 1
+    else:
+        floor -= 1
+
+    if floor == -1:
+        break
+
+    position += 1
+
+print(position)
diff --git a/2015/02/input b/2015/02/input
new file mode 100644
index 0000000..5f3335f
--- /dev/null
+++ b/2015/02/input
@@ -0,0 +1,1000 @@
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diff --git a/2015/02/part01.py b/2015/02/part01.py
new file mode 100644
index 0000000..bad9262
--- /dev/null
+++ b/2015/02/part01.py
@@ -0,0 +1,15 @@
+with open("input") as f:
+    puzzle_input = [n.strip() for n in f.readlines()]
+
+paper = 0
+
+for present_dim in puzzle_input:
+    parsed_dim = [int(x) for x in present_dim.split("x")]
+    parsed_dim.sort()
+    print(parsed_dim)
+
+    [l, w, h] = parsed_dim
+
+    paper += 3 * l * w + 2 * w * h + 2 * h * l
+
+print(paper)
diff --git a/2015/02/part02.py b/2015/02/part02.py
new file mode 100644
index 0000000..83967c5
--- /dev/null
+++ b/2015/02/part02.py
@@ -0,0 +1,14 @@
+with open("input") as f:
+    puzzle_input = [n.strip() for n in f.readlines()]
+
+ribbon = 0
+
+for present_dim in puzzle_input:
+    parsed_dim = [int(x) for x in present_dim.split("x")]
+    parsed_dim.sort()
+
+    [l, w, h] = parsed_dim
+
+    ribbon += 2 * l + 2 * w + l * w * h
+
+print(ribbon)
diff --git a/2015/03/input b/2015/03/input
new file mode 100644
index 0000000..6e8d40e
--- /dev/null
+++ b/2015/03/input
@@ -0,0 +1 @@
+^^<<v<<v><v^^<><>^^<v<v^>>^^^><^>v^>v><><><<vv^^<^>^^<v^>v>v^v>>>^<>v<^<v^><^>>>>><<v>>^>>^>v^>><<^>v>v<>^v^v^vvv><>^^>v><v<><>^><^^<vv^v<v>^v>>^v^>v><>v^<vv>^><<v^>vv^<<>v>>><<<>>^<vv<^<>^^vv>>>^><<<<vv^v^>>><><^>v<>^>v<v^v<^vv><^v^><<<<>^<>v>^v>v<v<v<<>v<^<<<v>>>>>^^v>vv^^<>^<>^^^^<^^^v<v^^>v<^^v^^>v>^v^^^^>><<v<>v<>^v^<v<>><>^^><<^^<^^>vv<>v^<^v<vv<<<>^>^^>^<>v^^vv<>>v><<<>vvv<>v<>><^<^v<>^vv>^^v<v<v><^<>>vv<^>>^>>vv^v<vv^vv<^<<>>^v^<>^>>>>vv>^^>v>vv>v><^vv^<<v>^<<^^<v<v>vv<v^^<>^^v>^>>v><^<<vv<<v^vv^^^v>>v<<v^><vv^><vv<^vv<<vv^v<<^v<^^v>><<v^>>^^<>v>><<v<>>^^<v>>^^>>vvv^><<<<<^<^vv<^<><v<<>^^^<<<^>^^^<v<<vv>vv<>^<>v<^v>^<<<v<v<v>>^v<>>v<<^<<v<<>^<<<><><>^>>>>^>v^v<<v<v<<>>vv<^vvv^^^^<vv>vv>^v^^v^<v^v><^vv<^vv>v<^>vv<>>^>^><vv<><^>v>^v>vvv<>^>^v<><>vv>><^v^<><><v>>v^v^><^<^>vv>v<^>vvv>v<<<<<^<v<<vv<^^^<<>>^v<vv<^<>v>^<v<>><><>^<<v>v^>^<vv>><><>>^>^>><^<v>^^>^^>^^v^^<^v^^>v^^>>><<><v<v<<v^vv<><><>^<v>^<<^^v^>v>><>^^^><^vvv<^^^^^v><<><v<^^v><><>>^>vv<vvvv<<>>><v<^^^^v<<^><v>^vv<v^^v^vv<^^>^^<v>><<v^>v<^^>^<^<v<^^v>^<<v>^>>>^v<>v<^^^>vvv^v<<^><>>><vvv^<^^^<^>>v>>><v>^^vvv^vvv<^^^^v^v^<vv^<v>^<<^>v^v^<<><>><^v><v<><<>><<<>^v>v<>^<v^v>^vv>>^<>v^^<<v><^v>>v<>>^v^^>><^>v^<^v^^>><>v^>^v^v<<<v^<v^^v<^>v<><>vv>>>>^>v<>v<<<>^^>vv^v<><v^<>^<<<<>>^^>^v<v^v<<><>^v<>>^v^<<^<^>>>^vv<><v<^^<>v^>>v<^^v<v>>>^>><<><<<>><vv<v>>^v>><^<v><vv>^vv<v<>>><>v^><>vv<^^v^^^v<>><^vvv<<^<>v>>>v>><v><>>><>><v^><v^v<v>^v>v<v>>^^<^>^>v><>vv>^v><<>>>>>>>^<<^vv^^vvvv<^^><<<v<<>vvv<>^><<v<v^v^<<v>v<>>^<vv^<v<v>^<<^^vv>v>^<vv<<>v<v^<>v>>^v^^vvvv>^^>>v^v^^><<^>v>>^^>^<^^<>v<v>vv^vv>v<v>>^v<><^vv^<vv<v^^^v<^v^>>^v>>>^^<^<^>^v^>^>>>^v>^>^^^>>^<>v^^<>^v<<^^>^^<vv<>v<^v^>><^v^>^<>>^vv^vv^>v^<vvvvvv^>><^^<^v<^<v^<<^^<<v^<^>><>v><^v^v^^^v>v^<>^<<v<^^vvv<v>^^>^v^^<><vv^v^>v^<<>>vv<>>>>v>v<>^>>>v<>^^><v<v^^^<>^<^><>^><<v>><>^<<>>><<^<vvv<^><v>>^vv^v>><v<>vv^<<^^<<><v><<^<v<vv<<^v^vv>v^>>>v<<<<v<<>v>^vv<^v><v<v>v<^>^^vv>v><v>><<v<<v^v>>><>^<>><><<^<<^v^v<<v>v>v<v<^^>vv<^v^^^<v^<<<v<>v^><^v>^<^<v>>^<<<v>>v^<><>>^v<>vvv<vvvvv<^^><^>><^^>^>^v^vv<^><<^v>><^^v>^v<>^>vvvv><^>^<<v^^vv<v^^<><>v>^>>^<^<<<^v^^^>^>>^>><><<^>v^^<v>>v<<<<vvv<vvvv^<^<v^^<>^>vvv^<vv^v^v>^<<><v><^v^v^^^>^^>^vv<>v>>v^>vv^vv>v<^v^^>>^v^v<>>^^><<v<<>><>>>^>^<>^^v^^><^<>><<^<vv^^^^^>>vv^<v^<^>>>>v<<><<^>vv>vvv>^<><>>>>vv><<v^v<^^^<<^^^vv^<v<><><<<<>><<v^<>v>v^><>v^v^^><>v>v>^^v<^v<>>^^^^^<v>><v^>^^<v>><v^^>v<^<^>>>^><^^>><<>>^><>^^^>v^^^>^^v^<>^^><^>>><><^>>v<v^>v<^><v<v^<>v<^v>v^<^vv^^><<<><><^v^<v<^^>v>v^>>^^vv^<v>^v>^<^v<>^>^><^<v>^v><^<^<>v^^>^><>>><<v><<><>v<<^v^^<^><>^<><><v>v<^^<v<v>>^^<<>>^<v>><^><^<^>^^v<>v>>><><<>^>v><><<<<v^^^^v<>>^^^v>><<^v>^>>><vv^>>^vv<^<>>^<^^<^v>v<v<<<<<>^<<^<<<<<^<^>>^><<>><>v^v>^<^>v^<><vvv^>^v^v^v><^<v<>vv<<^<>^^^<>^v>^<v^^<v^v>v<>>^>v<<>v<>v^v>v<<<>>v>vv>>v<<>v<>v<^>^>^<v>>v>^>^^^<vv>v<<>>><v>^vvv^^>^^<^vv^^^^>v>^v^>v^^v^>>^v>^vv>^^v^<<<<>^<><^<^<<^^>v^^^v<>>vvv<v>>vv><v<v>^<^v>>^v<vv^<<v<vv><^^v^v>v<>^v<<<^^v^^^<^v>v^v^v>><vvv<<>v<>^v>vv^v>vv<<^v<v>^v>v>><^v<v<>v>>>><<<><vv><>^v^<^vvv>v<>><^v>^>><v>vv<><><>v><>>><^>vv>>^<>v^>>^><<<^><<>^v^>>><><>vv>^<>^>^v^^><^>>><<>v^<^vv>^<^vv>><v<>vv<v><><<^><>v<^^<^>vv^^^^vv<<v><>vv<><v>v<>>>>^><v><>^<><>v<>><<>^^vvv>^^^<><>>vvv^v>><>vv<vv>^^^v^<<>^^v<><<^^v<>^^>^<^^v>>v^v^^>>v>>>^<<^<>^>^^v>>>><vv<<>^v<<vv><<^^vv><^>vv<>>v<v>v^>v>>v^<vv<<<v><v^>vvv^^>vv^<<v>v^>>v^<>>><><<^^<^v>^>>>v>v>^v<>vv><vv<vvv<<v>v>^v<<<>><<><><>v^>>>v^>v^>>vv^^<v>^<>>><^>v^<>^^><v>v<><<<><v^v<<<v<v^>v^v>^>v<^<>v>v^^>>v>vv^v<>>^^^^<>v^>>>>>>>><v<^<<vvv<^v^>^v<^<<>>><<<^<<^>^>v^<>^<<<>v>><^vv^>^>^>>>^<vv><v^^^<v^<v<><v^vvv<>v<vvv^vv<<<v^<^<^vvvv^<<vv<^v><<>^>^<v^v^<^>v^><>>v^>v^>^>>v<>vv^v<<>^^>>vv<>vv>>^v<^vv>^v>v<v^vvv^<<^><>v^<><vv><>v^^><<<><>^>^v^<>><vv<^>v^v>v<>><v<<^>^<vv<^v>^<<v><^<^^vv^<>><v^>^vv^<>>^^^^v>v><^^^v^<<<>^<^<<>><>>v<<^v^>><><v^>>^vv^v>vv>>>>>>^^<<>v^>v^v>^^>>><vv^^^v>^v>>^^^<>><>v^<<<v<vv^^<v^<<<>v>v^^^<vv<>>^v>^v<^<<><>vv>^^^<^^vv<v<<vv>^^>vv>v<<^>^vv><^><v>^^^^v<<vv>v^<<^^>>^^vvvv^v^>vv>>v^<v>vvv<>>^><>>v^^>>^<>>vvvv^>><v^v<^^<^vv>>v<<^<<^><v^^><v^>v^>><<<v>v>v^>^v<v^vv<^^^v<^<vvvvv<<vvv>><>v<v<v<<^v<><<>vv>><v>><^>>^^v>^>><>vv^><<>>vv<<<^<^^>^<<^>>>><v<^v<<<>>v>vv<^>^v><>>v<v^v<>v^vvvv>v^>>v><<^<v>^^v>>vv^^>v>^v>^v^^>^<^vv<v<<^>vv<<^>>^<<^^>>^<^>v^><^vv>^^v><v^>>><>v^v>^v<^><<<>vv><v>v<><>>v^<>^^>^<>^<<^>>vv^><^<v<^^vvv>>v^>>v^>v>vv><>>v<^>><<<v<<vv><v<v<v>v<v>vv^vvv^vv^>^>v><vv<v^^<>>>>vv^>^<>v<^>^<^v>vv<^<<>>^<^<vv><^^<>^<<v^v^>v<<><v>v>><^v<<^vvv>v>v<<^^<^^>v<vv<v<v^v>^^^>^>vv<v<<^^v^<v<^>^^^vv>v<>>>vv>><><^><><<<vvv<<^^v^<v^<<^>>vv>vv^v^>>><v><<v^v>>v>>vv>^^vvv^>^^>^>^>^v<<^vv^>vvv^^vv><^>^v^>^><>v<^^vv<v><v^<><^<>><v>^^v^v>v^vv<>><^v>^<^v>^<>^v>>>><<vv^^^vv^>>><vv^v>>v><^v^vv><<^v<<>^^<v><^v>vvv<><^^><<^v><>^<^v<^^<^vvvv^^>>>>vv>v>>>v<v^><<<<v>>v^><v>>vv^v<vv<>vv<>vvv>>>><>>><>^v<v^v><vvv<<v^^v^v<>>><>>^vv<<v<><<vv<v^>^^vv><^v^v<v^vvv^v>v^^^vv>^><^vvv<<>^vvv^<v<v^v>>>>^<<<><<<<<^v<^^>>>>^>^<v^^^v<vvv<vv^<>v<<<^<^>>v^<v><<><<^^vvv^>v<>>^^>v>^v>>v<v><v>>>>^<^<^>v^v<vv<>^>><>^<<^vvv^^<>^<vvv<>v^>^^<<^>^vv><vvv>>v^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\ No newline at end of file
diff --git a/2015/03/part01.py b/2015/03/part01.py
new file mode 100644
index 0000000..2b19284
--- /dev/null
+++ b/2015/03/part01.py
@@ -0,0 +1,19 @@
+with open("input") as f:
+    puzzle_input = f.read()
+
+# puzzle_input = "^v^v^v^v^v"
+
+coords = (0, 0)
+delivered_houses = set()
+delivered_houses.add(coords)
+
+MOVEMENTS = {">": (1, 0), "^": (0, 1), "<": (-1, 0), "v": (0, -1)}
+
+for char in puzzle_input:
+    [d_x, d_y] = MOVEMENTS[char]
+    coords = (coords[0] + d_x, coords[1] + d_y)
+
+    delivered_houses.add(coords)
+
+print(delivered_houses)
+print(len(delivered_houses))
diff --git a/2015/03/part02.py b/2015/03/part02.py
new file mode 100644
index 0000000..de47e3f
--- /dev/null
+++ b/2015/03/part02.py
@@ -0,0 +1,27 @@
+with open("input") as f:
+    puzzle_input = f.read()
+
+# puzzle_input = "^v^v^v^v^v"
+
+coords = (0, 0)
+delivered_houses = set()
+delivered_houses.add(coords)
+
+MOVEMENTS = {">": (1, 0), "^": (0, 1), "<": (-1, 0), "v": (0, -1)}
+
+SANTA_MOVES = puzzle_input[::2]
+ROBO_MOVES = puzzle_input[1::2]
+
+for char in SANTA_MOVES:
+    [d_x, d_y] = MOVEMENTS[char]
+    coords = (coords[0] + d_x, coords[1] + d_y)
+    delivered_houses.add(coords)
+
+coords = (0, 0)
+
+for char in ROBO_MOVES:
+    [d_x, d_y] = MOVEMENTS[char]
+    coords = (coords[0] + d_x, coords[1] + d_y)
+    delivered_houses.add(coords)
+
+print(len(delivered_houses))
diff --git a/2015/04/input b/2015/04/input
new file mode 100644
index 0000000..861f68d
--- /dev/null
+++ b/2015/04/input
@@ -0,0 +1 @@
+ckczppom
diff --git a/2015/04/part01.py b/2015/04/part01.py
new file mode 100644
index 0000000..603e311
--- /dev/null
+++ b/2015/04/part01.py
@@ -0,0 +1,20 @@
+from hashlib import md5
+
+with open("input") as f:
+    puzzle_input = f.read().strip()
+
+# puzzle_input = "abcdef"
+# puzzle_input = "pqrstuv"
+
+solution = 0
+
+cur_hash = ""
+
+while cur_hash[:5] != "00000":
+    solution += 1
+    md5_input = puzzle_input + str(solution)
+    cur_hash = md5(md5_input.encode("utf-8")).hexdigest()
+
+print(cur_hash)
+print(puzzle_input)
+print(solution)
diff --git a/2015/04/part02.py b/2015/04/part02.py
new file mode 100644
index 0000000..08839a2
--- /dev/null
+++ b/2015/04/part02.py
@@ -0,0 +1,20 @@
+from hashlib import md5
+
+with open("input") as f:
+    puzzle_input = f.read().strip()
+
+# puzzle_input = "abcdef"
+# puzzle_input = "pqrstuv"
+
+solution = 0
+
+cur_hash = ""
+
+while cur_hash[:6] != "000000":
+    solution += 1
+    md5_input = puzzle_input + str(solution)
+    cur_hash = md5(md5_input.encode("utf-8")).hexdigest()
+
+print(cur_hash)
+print(puzzle_input)
+print(solution)
diff --git a/2015/05/input b/2015/05/input
new file mode 100644
index 0000000..5642100
--- /dev/null
+++ b/2015/05/input
@@ -0,0 +1,1000 @@
+rthkunfaakmwmush
+qxlnvjguikqcyfzt
+sleaoasjspnjctqt
+lactpmehuhmzwfjl
+bvggvrdgjcspkkyj
+nwaceixfiasuzyoz
+hsapdhrxlqoiumqw
+lsitcmhlehasgejo
+hksifrqlsiqkzyex
+dfwuxtexmnvjyxqc
+iawwfwylyrcbxwak
+mamtkmvvaeeifnve
+qiqtuihvsaeebjkd
+skerkykytazvbupg
+kgnxaylpgbdzedoo
+plzkdktirhmumcuf
+pexcckdvsrahvbop
+jpocepxixeqjpigq
+vnsvxizubavwrhtc
+lqveclebkwnajppk
+ikbzllevuwxscogb
+xvfmkozbxzfuezjt
+ukeazxczeejwoxli
+tvtnlwcmhuezwney
+hoamfvwwcarfuqro
+wkvnmvqllphnsbnf
+kiggbamoppmfhmlf
+ughbudqakuskbiik
+avccmveveqwhnjdx
+llhqxueawluwmygt
+mgkgxnkunzbvakiz
+fwjbwmfxhkzmwtsq
+kzmtudrtznhutukg
+gtvnosbfetqiftmf
+aoifrnnzufvhcwuy
+cldmefgeuwlbxpof
+xdqfinwotmffynqz
+pajfvqhtlbhmyxai
+jkacnevnrxpgxqal
+esxqayxzvortsqgz
+glfoarwvkzgybqlz
+xdjcnevwhdfsnmma
+jyjktscromovdchb
+pvguwmhdvfxvapmz
+iheglsjvxmkzgdbu
+lwjioxdbyhqnwekv
+zcoguugygkwizryj
+ogvnripxxfeqpxdh
+hkvajhsbfnzsygbm
+cnjqeykecopwabpq
+wojjtbcjinoiuhsj
+kpwpvgxbyzczdzjq
+wrvhylisemlewgzk
+uiezkmnhilfzahtm
+mucteynnuxpxzmvt
+zaiwbgxefusfhmst
+apptbogpxivjwink
+qryboarjtwjhjgjb
+irehxupgyseaahzd
+fobstqxguyubggoh
+ysriumfghtxtfxwe
+auchdmasvfeliptw
+mztuhefcrnknyrdl
+tyjmkhihbwabjtaa
+yquzkdtgsljkaebw
+almvdvofjtkyzbmd
+emqftiuqqpdwwbrv
+hrrhmqfpepvbawvw
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diff --git a/2015/05/part01.py b/2015/05/part01.py
new file mode 100644
index 0000000..87ab58e
--- /dev/null
+++ b/2015/05/part01.py
@@ -0,0 +1,46 @@
+with open("input") as f:
+    puzzle_input = [n.strip() for n in f.readlines()]
+
+nice_words = 0
+
+
+def has_three_or_more_vowels(word):
+    vowels = 0
+    for char in word:
+        if char in "aeiou":
+            vowels += 1
+        if vowels >= 3:
+            return True
+    return False
+
+
+def has_letter_twice_in_a_row(word):
+    last = word[0]
+    for char in word[1:]:
+        if last == char:
+            return True
+        last = char
+    return False
+
+
+def contains_bad_string(word):
+    BAD_STRINGS = ["ab", "cd", "pq", "xy"]
+    for bad_string in BAD_STRINGS:
+        if bad_string in word:
+            return True
+    return False
+
+
+def is_nice_word(word):
+    return (
+        has_three_or_more_vowels(word)
+        and has_letter_twice_in_a_row(word)
+        and not contains_bad_string(word)
+    )
+
+
+for word in puzzle_input:
+    if is_nice_word(word):
+        nice_words += 1
+
+print(nice_words)
diff --git a/2015/05/part02.py b/2015/05/part02.py
new file mode 100644
index 0000000..db91a4e
--- /dev/null
+++ b/2015/05/part02.py
@@ -0,0 +1,36 @@
+with open("input") as f:
+    puzzle_input = [n.strip() for n in f.readlines()]
+
+# puzzle_input = ["qjhvhtzxzqqjkmpb", "xxyxx", "uurcxstgmygtbstg", "ieodomkazucvgmuy"]
+
+nice_words = 0
+
+
+def has_duplicate_pair(word):
+    for idx_a in range(len(word) - 3):
+        for idx_b in range(idx_a + 2, len(word) - 1):
+            pair_1 = word[idx_a] + word[idx_a + 1]
+            pair_2 = word[idx_b] + word[idx_b + 1]
+
+            if pair_1 == pair_2:
+                return True
+    return False
+
+
+def has_repeated_letter_with_one_between(word):
+    for idx, a in enumerate(word[:-2]):
+        b = word[idx + 2]
+        if a == b:
+            return True
+    return False
+
+
+def is_nice_word(word):
+    return has_duplicate_pair(word) and has_repeated_letter_with_one_between(word)
+
+
+for word in puzzle_input:
+    if is_nice_word(word):
+        nice_words += 1
+
+print(nice_words)
diff --git a/2015/06/input b/2015/06/input
new file mode 100644
index 0000000..495311e
--- /dev/null
+++ b/2015/06/input
@@ -0,0 +1,300 @@
+turn off 660,55 through 986,197
+turn off 341,304 through 638,850
+turn off 199,133 through 461,193
+toggle 322,558 through 977,958
+toggle 537,781 through 687,941
+turn on 226,196 through 599,390
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+turn on 158,270 through 243,802
+toggle 223,39 through 454,511
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diff --git a/2015/06/part01.py b/2015/06/part01.py
new file mode 100644
index 0000000..786e078
--- /dev/null
+++ b/2015/06/part01.py
@@ -0,0 +1,37 @@
+from collections import defaultdict
+
+with open("input") as f:
+    puzzle_input = [n.strip() for n in f.readlines()]
+
+
+lights = [[False for _ in range(1000)] for _ in range(1000)]
+
+for instruction in puzzle_input:
+    from_coords = instruction.split(" ")[-1::-1][2]
+    to_coords = instruction.split(" ")[-1::-1][0]
+    from_coords = [int(x) for x in from_coords.split(",")]
+    to_coords = [int(x) for x in to_coords.split(",")]
+
+    [x_1, y_1] = from_coords
+    [x_2, y_2] = to_coords
+
+    toggle_mode = instruction.startswith("toggle")
+    set_to = instruction.startswith("turn on")
+
+    for x in range(x_1, x_2 + 1):
+        for y in range(y_1, y_2 + 1):
+            if toggle_mode:
+                lights[x][y] = not lights[x][y]
+            else:
+                lights[x][y] = set_to
+
+    print(instruction, from_coords, to_coords)
+
+lights_on = 0
+
+for row in lights:
+    for light in row:
+        if light:
+            lights_on += 1
+
+print(lights_on)
diff --git a/2015/06/part02.py b/2015/06/part02.py
new file mode 100644
index 0000000..63c89ce
--- /dev/null
+++ b/2015/06/part02.py
@@ -0,0 +1,40 @@
+from collections import defaultdict
+
+with open("input") as f:
+    puzzle_input = [n.strip() for n in f.readlines()]
+
+
+lights = [[0 for _ in range(1000)] for _ in range(1000)]
+
+for instruction in puzzle_input:
+    from_coords = instruction.split(" ")[-1::-1][2]
+    to_coords = instruction.split(" ")[-1::-1][0]
+    from_coords = [int(x) for x in from_coords.split(",")]
+    to_coords = [int(x) for x in to_coords.split(",")]
+
+    [x_1, y_1] = from_coords
+    [x_2, y_2] = to_coords
+
+    diff = 0
+    if instruction.startswith("turn on"):
+        diff = 1
+    elif instruction.startswith("turn off"):
+        diff = -1
+    else:
+        diff = 2
+
+    for x in range(x_1, x_2 + 1):
+        for y in range(y_1, y_2 + 1):
+            lights[x][y] = lights[x][y] + diff
+            if lights[x][y] < 0:
+                lights[x][y] = 0
+
+    print(instruction, from_coords, to_coords)
+
+brightness = 0
+
+for row in lights:
+    for light in row:
+        brightness += light
+
+print(brightness)
diff --git a/2015/07/example b/2015/07/example
new file mode 100644
index 0000000..27b4f8d
--- /dev/null
+++ b/2015/07/example
@@ -0,0 +1,8 @@
+123 -> x
+456 -> y
+x AND y -> d
+x OR y -> e
+x LSHIFT 2 -> f
+y RSHIFT 2 -> g
+NOT x -> h
+NOT y -> i
diff --git a/2015/07/input b/2015/07/input
new file mode 100644
index 0000000..1b7dfc9
--- /dev/null
+++ b/2015/07/input
@@ -0,0 +1,339 @@
+bn RSHIFT 2 -> bo
+lf RSHIFT 1 -> ly
+fo RSHIFT 3 -> fq
+cj OR cp -> cq
+fo OR fz -> ga
+t OR s -> u
+lx -> a
+NOT ax -> ay
+he RSHIFT 2 -> hf
+lf OR lq -> lr
+lr AND lt -> lu
+dy OR ej -> ek
+1 AND cx -> cy
+hb LSHIFT 1 -> hv
+1 AND bh -> bi
+ih AND ij -> ik
+c LSHIFT 1 -> t
+ea AND eb -> ed
+km OR kn -> ko
+NOT bw -> bx
+ci OR ct -> cu
+NOT p -> q
+lw OR lv -> lx
+NOT lo -> lp
+fp OR fv -> fw
+o AND q -> r
+dh AND dj -> dk
+ap LSHIFT 1 -> bj
+bk LSHIFT 1 -> ce
+NOT ii -> ij
+gh OR gi -> gj
+kk RSHIFT 1 -> ld
+lc LSHIFT 1 -> lw
+lb OR la -> lc
+1 AND am -> an
+gn AND gp -> gq
+lf RSHIFT 3 -> lh
+e OR f -> g
+lg AND lm -> lo
+ci RSHIFT 1 -> db
+cf LSHIFT 1 -> cz
+bn RSHIFT 1 -> cg
+et AND fe -> fg
+is OR it -> iu
+kw AND ky -> kz
+ck AND cl -> cn
+bj OR bi -> bk
+gj RSHIFT 1 -> hc
+iu AND jf -> jh
+NOT bs -> bt
+kk OR kv -> kw
+ks AND ku -> kv
+hz OR ik -> il
+b RSHIFT 1 -> v
+iu RSHIFT 1 -> jn
+fo RSHIFT 5 -> fr
+be AND bg -> bh
+ga AND gc -> gd
+hf OR hl -> hm
+ld OR le -> lf
+as RSHIFT 5 -> av
+fm OR fn -> fo
+hm AND ho -> hp
+lg OR lm -> ln
+NOT kx -> ky
+kk RSHIFT 3 -> km
+ek AND em -> en
+NOT ft -> fu
+NOT jh -> ji
+jn OR jo -> jp
+gj AND gu -> gw
+d AND j -> l
+et RSHIFT 1 -> fm
+jq OR jw -> jx
+ep OR eo -> eq
+lv LSHIFT 15 -> lz
+NOT ey -> ez
+jp RSHIFT 2 -> jq
+eg AND ei -> ej
+NOT dm -> dn
+jp AND ka -> kc
+as AND bd -> bf
+fk OR fj -> fl
+dw OR dx -> dy
+lj AND ll -> lm
+ec AND ee -> ef
+fq AND fr -> ft
+NOT kp -> kq
+ki OR kj -> kk
+cz OR cy -> da
+as RSHIFT 3 -> au
+an LSHIFT 15 -> ar
+fj LSHIFT 15 -> fn
+1 AND fi -> fj
+he RSHIFT 1 -> hx
+lf RSHIFT 2 -> lg
+kf LSHIFT 15 -> kj
+dz AND ef -> eh
+ib OR ic -> id
+lf RSHIFT 5 -> li
+bp OR bq -> br
+NOT gs -> gt
+fo RSHIFT 1 -> gh
+bz AND cb -> cc
+ea OR eb -> ec
+lf AND lq -> ls
+NOT l -> m
+hz RSHIFT 3 -> ib
+NOT di -> dj
+NOT lk -> ll
+jp RSHIFT 3 -> jr
+jp RSHIFT 5 -> js
+NOT bf -> bg
+s LSHIFT 15 -> w
+eq LSHIFT 1 -> fk
+jl OR jk -> jm
+hz AND ik -> im
+dz OR ef -> eg
+1 AND gy -> gz
+la LSHIFT 15 -> le
+br AND bt -> bu
+NOT cn -> co
+v OR w -> x
+d OR j -> k
+1 AND gd -> ge
+ia OR ig -> ih
+NOT go -> gp
+NOT ed -> ee
+jq AND jw -> jy
+et OR fe -> ff
+aw AND ay -> az
+ff AND fh -> fi
+ir LSHIFT 1 -> jl
+gg LSHIFT 1 -> ha
+x RSHIFT 2 -> y
+db OR dc -> dd
+bl OR bm -> bn
+ib AND ic -> ie
+x RSHIFT 3 -> z
+lh AND li -> lk
+ce OR cd -> cf
+NOT bb -> bc
+hi AND hk -> hl
+NOT gb -> gc
+1 AND r -> s
+fw AND fy -> fz
+fb AND fd -> fe
+1 AND en -> eo
+z OR aa -> ab
+bi LSHIFT 15 -> bm
+hg OR hh -> hi
+kh LSHIFT 1 -> lb
+cg OR ch -> ci
+1 AND kz -> la
+gf OR ge -> gg
+gj RSHIFT 2 -> gk
+dd RSHIFT 2 -> de
+NOT ls -> lt
+lh OR li -> lj
+jr OR js -> jt
+au AND av -> ax
+0 -> c
+he AND hp -> hr
+id AND if -> ig
+et RSHIFT 5 -> ew
+bp AND bq -> bs
+e AND f -> h
+ly OR lz -> ma
+1 AND lu -> lv
+NOT jd -> je
+ha OR gz -> hb
+dy RSHIFT 1 -> er
+iu RSHIFT 2 -> iv
+NOT hr -> hs
+as RSHIFT 1 -> bl
+kk RSHIFT 2 -> kl
+b AND n -> p
+ln AND lp -> lq
+cj AND cp -> cr
+dl AND dn -> do
+ci RSHIFT 2 -> cj
+as OR bd -> be
+ge LSHIFT 15 -> gi
+hz RSHIFT 5 -> ic
+dv LSHIFT 1 -> ep
+kl OR kr -> ks
+gj OR gu -> gv
+he RSHIFT 5 -> hh
+NOT fg -> fh
+hg AND hh -> hj
+b OR n -> o
+jk LSHIFT 15 -> jo
+gz LSHIFT 15 -> hd
+cy LSHIFT 15 -> dc
+kk RSHIFT 5 -> kn
+ci RSHIFT 3 -> ck
+at OR az -> ba
+iu RSHIFT 3 -> iw
+ko AND kq -> kr
+NOT eh -> ei
+aq OR ar -> as
+iy AND ja -> jb
+dd RSHIFT 3 -> df
+bn RSHIFT 3 -> bp
+1 AND cc -> cd
+at AND az -> bb
+x OR ai -> aj
+kk AND kv -> kx
+ao OR an -> ap
+dy RSHIFT 3 -> ea
+x RSHIFT 1 -> aq
+eu AND fa -> fc
+kl AND kr -> kt
+ia AND ig -> ii
+df AND dg -> di
+NOT fx -> fy
+k AND m -> n
+bn RSHIFT 5 -> bq
+km AND kn -> kp
+dt LSHIFT 15 -> dx
+hz RSHIFT 2 -> ia
+aj AND al -> am
+cd LSHIFT 15 -> ch
+hc OR hd -> he
+he RSHIFT 3 -> hg
+bn OR by -> bz
+NOT kt -> ku
+z AND aa -> ac
+NOT ak -> al
+cu AND cw -> cx
+NOT ie -> if
+dy RSHIFT 2 -> dz
+ip LSHIFT 15 -> it
+de OR dk -> dl
+au OR av -> aw
+jg AND ji -> jj
+ci AND ct -> cv
+dy RSHIFT 5 -> eb
+hx OR hy -> hz
+eu OR fa -> fb
+gj RSHIFT 3 -> gl
+fo AND fz -> gb
+1 AND jj -> jk
+jp OR ka -> kb
+de AND dk -> dm
+ex AND ez -> fa
+df OR dg -> dh
+iv OR jb -> jc
+x RSHIFT 5 -> aa
+NOT hj -> hk
+NOT im -> in
+fl LSHIFT 1 -> gf
+hu LSHIFT 15 -> hy
+iq OR ip -> ir
+iu RSHIFT 5 -> ix
+NOT fc -> fd
+NOT el -> em
+ck OR cl -> cm
+et RSHIFT 3 -> ev
+hw LSHIFT 1 -> iq
+ci RSHIFT 5 -> cl
+iv AND jb -> jd
+dd RSHIFT 5 -> dg
+as RSHIFT 2 -> at
+NOT jy -> jz
+af AND ah -> ai
+1 AND ds -> dt
+jx AND jz -> ka
+da LSHIFT 1 -> du
+fs AND fu -> fv
+jp RSHIFT 1 -> ki
+iw AND ix -> iz
+iw OR ix -> iy
+eo LSHIFT 15 -> es
+ev AND ew -> ey
+ba AND bc -> bd
+fp AND fv -> fx
+jc AND je -> jf
+et RSHIFT 2 -> eu
+kg OR kf -> kh
+iu OR jf -> jg
+er OR es -> et
+fo RSHIFT 2 -> fp
+NOT ca -> cb
+bv AND bx -> by
+u LSHIFT 1 -> ao
+cm AND co -> cp
+y OR ae -> af
+bn AND by -> ca
+1 AND ke -> kf
+jt AND jv -> jw
+fq OR fr -> fs
+dy AND ej -> el
+NOT kc -> kd
+ev OR ew -> ex
+dd OR do -> dp
+NOT cv -> cw
+gr AND gt -> gu
+dd RSHIFT 1 -> dw
+NOT gw -> gx
+NOT iz -> ja
+1 AND io -> ip
+NOT ag -> ah
+b RSHIFT 5 -> f
+NOT cr -> cs
+kb AND kd -> ke
+jr AND js -> ju
+cq AND cs -> ct
+il AND in -> io
+NOT ju -> jv
+du OR dt -> dv
+dd AND do -> dq
+b RSHIFT 2 -> d
+jm LSHIFT 1 -> kg
+NOT dq -> dr
+bo OR bu -> bv
+gk OR gq -> gr
+he OR hp -> hq
+NOT h -> i
+hf AND hl -> hn
+gv AND gx -> gy
+x AND ai -> ak
+bo AND bu -> bw
+hq AND hs -> ht
+hz RSHIFT 1 -> is
+gj RSHIFT 5 -> gm
+g AND i -> j
+gk AND gq -> gs
+dp AND dr -> ds
+b RSHIFT 3 -> e
+gl AND gm -> go
+gl OR gm -> gn
+y AND ae -> ag
+hv OR hu -> hw
+1674 -> b
+ab AND ad -> ae
+NOT ac -> ad
+1 AND ht -> hu
+NOT hn -> ho
diff --git a/2015/07/part1.py b/2015/07/part1.py
new file mode 100644
index 0000000..f1a94ed
--- /dev/null
+++ b/2015/07/part1.py
@@ -0,0 +1,55 @@
+with open("input") as f:
+    instructions = [n.strip() for n in f.readlines()]
+
+SOURCES = dict()
+
+for instruction in instructions:
+    print(instruction)
+    [operation, wire] = instruction.split(" -> ")
+    SOURCES[wire] = operation
+
+print(SOURCES)
+
+
+def evaluate_wire(wire):
+    try:
+        return int(wire)
+    except ValueError:
+        pass
+
+    operation = SOURCES[wire]
+    print("evaluating wire", wire, "; operation:", operation)
+
+    parameters = operation.split(" ")
+
+    result = None
+
+    if "NOT" in operation:
+        [_, a] = parameters
+        result = evaluate_wire(a) ^ 0b1111111111111111
+    elif "OR" in operation:
+        [a, _, b] = parameters
+        result = evaluate_wire(a) | evaluate_wire(b)
+    elif "AND" in operation:
+        [a, _, b] = parameters
+        result = evaluate_wire(a) & evaluate_wire(b)
+    elif "LSHIFT" in operation:
+        [a, _, b] = parameters
+        result = evaluate_wire(a) << evaluate_wire(b)
+    elif "RSHIFT" in operation:
+        [a, _, b] = parameters
+        result = evaluate_wire(a) >> evaluate_wire(b)
+    else:
+        result = evaluate_wire(operation)
+
+    SOURCES[wire] = str(result)
+    return result
+
+
+print(evaluate_wire("a"))
+# for wire in ["d", "e", "f", "g", "h", "i"]:
+#     print("==", wire, "==")
+#     print(evaluate_wire(wire))
+# print(SOURCES)
+
+print("finish")
diff --git a/2015/07/part2.py b/2015/07/part2.py
new file mode 100644
index 0000000..eb39b83
--- /dev/null
+++ b/2015/07/part2.py
@@ -0,0 +1,56 @@
+with open("input") as f:
+    instructions = [n.strip() for n in f.readlines()]
+
+solution_part_1 = 46065
+
+SOURCES = dict()
+
+for instruction in instructions:
+    print(instruction)
+    [operation, wire] = instruction.split(" -> ")
+    SOURCES[wire] = operation
+
+SOURCES["b"] = solution_part_1
+
+
+def evaluate_wire(wire):
+    try:
+        return int(wire)
+    except ValueError:
+        pass
+
+    operation = SOURCES[wire]
+    print("evaluating wire", wire, "; operation:", operation)
+
+    if type(operation) == int:
+        return operation
+
+    parameters = operation.split(" ")
+
+    result = None
+
+    if "NOT" in operation:
+        [_, a] = parameters
+        result = evaluate_wire(a) ^ 0b1111111111111111
+    elif "OR" in operation:
+        [a, _, b] = parameters
+        result = evaluate_wire(a) | evaluate_wire(b)
+    elif "AND" in operation:
+        [a, _, b] = parameters
+        result = evaluate_wire(a) & evaluate_wire(b)
+    elif "LSHIFT" in operation:
+        [a, _, b] = parameters
+        result = evaluate_wire(a) << evaluate_wire(b)
+    elif "RSHIFT" in operation:
+        [a, _, b] = parameters
+        result = evaluate_wire(a) >> evaluate_wire(b)
+    else:
+        result = evaluate_wire(operation)
+
+    SOURCES[wire] = str(result)
+    return result
+
+
+print(evaluate_wire("a"))
+
+print("finish")
diff --git a/2015/08/input b/2015/08/input
new file mode 100644
index 0000000..3309605
--- /dev/null
+++ b/2015/08/input
@@ -0,0 +1,300 @@
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diff --git a/2015/08/part1.py b/2015/08/part1.py
new file mode 100644
index 0000000..ca62025
--- /dev/null
+++ b/2015/08/part1.py
@@ -0,0 +1,25 @@
+with open("input") as f:
+    lines = [n.strip() for n in f.readlines()]
+
+solution = 0
+
+for line in lines:
+    char_count = 0
+    i = 1
+    while i < len(line) - 1:
+        char = line[i]
+        if char == "\\":
+            next_char = line[i + 1]
+            if next_char in ["\\", '"']:
+                i += 1
+            elif next_char in ["x"]:
+                i += 3
+        char_count += 1
+        i += 1
+
+    literal_count = len(line)
+
+    print(f"{line}: {literal_count=}, {char_count=}")
+    solution += literal_count - char_count
+
+print(solution)
diff --git a/2015/08/part2.py b/2015/08/part2.py
new file mode 100644
index 0000000..85d0b7e
--- /dev/null
+++ b/2015/08/part2.py
@@ -0,0 +1,21 @@
+with open("input") as f:
+    lines = [n.strip() for n in f.readlines()]
+
+solution = 0
+
+for line in lines:
+    literal_count = len(line)
+
+    char_count = 2  # surrounding double quotes: '"'
+    i = 0
+    while i < len(line):
+        char = line[i]
+        if char in ['"', "\\", ""]:
+            char_count += 1
+        char_count += 1
+        i += 1
+
+    print(f"{line}: {literal_count=}, {char_count=}")
+    solution += char_count - literal_count
+
+print(solution)
diff --git a/2015/09/input b/2015/09/input
new file mode 100644
index 0000000..97a6b63
--- /dev/null
+++ b/2015/09/input
@@ -0,0 +1,28 @@
+Faerun to Tristram = 65
+Faerun to Tambi = 129
+Faerun to Norrath = 144
+Faerun to Snowdin = 71
+Faerun to Straylight = 137
+Faerun to AlphaCentauri = 3
+Faerun to Arbre = 149
+Tristram to Tambi = 63
+Tristram to Norrath = 4
+Tristram to Snowdin = 105
+Tristram to Straylight = 125
+Tristram to AlphaCentauri = 55
+Tristram to Arbre = 14
+Tambi to Norrath = 68
+Tambi to Snowdin = 52
+Tambi to Straylight = 65
+Tambi to AlphaCentauri = 22
+Tambi to Arbre = 143
+Norrath to Snowdin = 8
+Norrath to Straylight = 23
+Norrath to AlphaCentauri = 136
+Norrath to Arbre = 115
+Snowdin to Straylight = 101
+Snowdin to AlphaCentauri = 84
+Snowdin to Arbre = 96
+Straylight to AlphaCentauri = 107
+Straylight to Arbre = 14
+AlphaCentauri to Arbre = 46
diff --git a/2015/09/part1.py b/2015/09/part1.py
new file mode 100644
index 0000000..3556173
--- /dev/null
+++ b/2015/09/part1.py
@@ -0,0 +1,43 @@
+import itertools
+
+with open("input") as f:
+    connections = [n.strip() for n in f.readlines()]
+
+GRAPH = dict()
+LOCATIONS = set()
+
+for connection in connections:
+    [location_a, _, location_b, _, distance] = connection.split(" ")
+    distance = int(distance)
+
+    LOCATIONS.add(location_a)
+    LOCATIONS.add(location_b)
+    GRAPH[(location_a, location_b)] = distance
+    GRAPH[(location_b, location_a)] = distance
+
+
+def calculate_distance(route):
+    dist = 0
+    for i in range(len(route) - 1):
+        location_a = route[i]
+        location_b = route[i + 1]
+        if (location_a, location_b) not in GRAPH:
+            return None
+        dist += GRAPH[(location_a, location_b)]
+    return dist
+
+
+SHORTEST_ROUTE = None
+SHORTEST_DISTANCE = None
+
+for route in itertools.permutations(LOCATIONS, len(LOCATIONS)):
+    dist = calculate_distance(route)
+    if dist is None:
+        continue
+
+    if SHORTEST_DISTANCE is None or dist < SHORTEST_DISTANCE:
+        SHORTEST_DISTANCE = dist
+        SHORTEST_ROUTE = route
+
+print(SHORTEST_ROUTE)
+print(SHORTEST_DISTANCE)
diff --git a/2015/09/part2.py b/2015/09/part2.py
new file mode 100644
index 0000000..7d25b97
--- /dev/null
+++ b/2015/09/part2.py
@@ -0,0 +1,43 @@
+import itertools
+
+with open("input") as f:
+    connections = [n.strip() for n in f.readlines()]
+
+GRAPH = dict()
+LOCATIONS = set()
+
+for connection in connections:
+    [location_a, _, location_b, _, distance] = connection.split(" ")
+    distance = int(distance)
+
+    LOCATIONS.add(location_a)
+    LOCATIONS.add(location_b)
+    GRAPH[(location_a, location_b)] = distance
+    GRAPH[(location_b, location_a)] = distance
+
+
+def calculate_distance(route):
+    dist = 0
+    for i in range(len(route) - 1):
+        location_a = route[i]
+        location_b = route[i + 1]
+        if (location_a, location_b) not in GRAPH:
+            return None
+        dist += GRAPH[(location_a, location_b)]
+    return dist
+
+
+LONGEST_ROUTE = None
+LONGEST_DISTANCE = None
+
+for route in itertools.permutations(LOCATIONS, len(LOCATIONS)):
+    dist = calculate_distance(route)
+    if dist is None:
+        continue
+
+    if LONGEST_DISTANCE is None or dist > LONGEST_DISTANCE:
+        LONGEST_DISTANCE = dist
+        LONGEST_ROUTE = route
+
+print(LONGEST_ROUTE)
+print(LONGEST_DISTANCE)
diff --git a/2015/10/atoms b/2015/10/atoms
new file mode 100644
index 0000000..421a39d
--- /dev/null
+++ b/2015/10/atoms
@@ -0,0 +1,94 @@
+94 Pu 31221132221222112112322211 Np 
+93 Np 1311222113321132211221121332211 Hf Pa H Ca Pu 
+92 U 3 Pa 
+91 Pa 13 Th 
+90 Th 1113 Ac 
+89 Ac 3113 Ra 
+88 Ra 132113 Fr 
+87 Fr 1113122113 Rn 
+86 Rn 311311222113 Ho At 
+85 At 1322113 Po 
+84 Po 1113222113 Bi 
+83 Bi 3113322113 Pm Pb 
+82 Pb 123222113 Tl 
+81 Tl 111213322113 Hg 
+80 Hg 31121123222113 Au 
+79 Au 132112211213322113 Pt 
+78 Pt 111312212221121123222113 Ir 
+77 Ir 3113112211322112211213322113 Os 
+76 Os 1321132122211322212221121123222113 Re 
+75 Re 111312211312113221133211322112211213322113 Ge Ca W 
+74 W 312211322212221121123222113 Ta 
+73 Ta 13112221133211322112211213322113 Hf Pa H Ca W 
+72 Hf 11132 Lu 
+71 Lu 311312 Yb 
+70 Yb 1321131112 Tm 
+69 Tm 11131221133112 Er Ca Co 
+68 Er 311311222 Ho Pm 
+67 Ho 1321132 Dy 
+66 Dy 111312211312 Tb 
+65 Tb 3113112221131112 Ho Gd 
+64 Gd 13221133112 Eu Ca Co 
+63 Eu 1113222 Sm 
+62 Sm 311332 Pm Ca Zn 
+61 Pm 132 Nd 
+60 Nd 111312 Pr 
+59 Pr 31131112 Ce 
+58 Ce 1321133112 La H Ca Co 
+57 La 11131 Ba 
+56 Ba 311311 Cs 
+55 Cs 13211321 Xe 
+54 Xe 11131221131211 I 
+53 I 311311222113111221 Ho Te 
+52 Te 1322113312211 Eu Ca Sb 
+51 Sb 3112221 Pm Sn 
+50 Sn 13211 In 
+49 In 11131221 Cd 
+48 Cd 3113112211 Ag 
+47 Ag 132113212221 Pd 
+46 Pd 111312211312113211 Rh 
+45 Rh 311311222113111221131221 Ho Ru 
+44 Ru 132211331222113112211 Eu Ca Tc 
+43 Tc 311322113212221 Mo 
+42 Mo 13211322211312113211 Nb 
+41 Nb 1113122113322113111221131221 Er Zr 
+40 Zr 12322211331222113112211 Y H Ca Tc 
+39 Y 1112133 Sr U 
+38 Sr 3112112 Rb 
+37 Rb 1321122112 Kr 
+36 Kr 11131221222112 Br 
+35 Br 3113112211322112 Se 
+34 Se 13211321222113222112 As 
+33 As 11131221131211322113322112 Ge Na 
+32 Ge 31131122211311122113222 Ho Ga 
+31 Ga 13221133122211332 Eu Ca Ac H Ca Zn 
+30 Zn 312 Cu 
+29 Cu 131112 Ni 
+28 Ni 11133112 Zn Co 
+27 Co 32112 Fe 
+26 Fe 13122112 Mn 
+25 Mn 111311222112 Cr Si 
+24 Cr 31132 V 
+23 V 13211312 Ti 
+22 Ti 11131221131112 Sc 
+21 Sc 3113112221133112 Ho Pa H Ca Co 
+20 Ca 12 K 
+19 K 1112 Ar 
+18 Ar 3112 Cl 
+17 Cl 132112 S 
+16 S 1113122112 P 
+15 P 311311222112 Ho Si 
+14 Si 1322112 Al 
+13 Al 1113222112 Mg 
+12 Mg 3113322112 Pm Na 
+11 Na 123222112 Ne 
+10 Ne 111213322112 F 
+9 F 31121123222112 O 
+8 O 132112211213322112 N 
+7 N 111312212221121123222112 C 
+6 C 3113112211322112211213322112 B 
+5 B 1321132122211322212221121123222112 Be 
+4 Be 111312211312113221133211322112211213322112 Ge Ca Li 
+3 Li 312211322212221121123222112 He 
+2 He 13112221133211322112211213322112 Hf Pa H Ca Li 
+1 H 22 H 
diff --git a/2015/10/input b/2015/10/input
new file mode 100644
index 0000000..067b0ee
--- /dev/null
+++ b/2015/10/input
@@ -0,0 +1 @@
+1321131112
diff --git a/2015/10/part1.py b/2015/10/part1.py
new file mode 100644
index 0000000..2cd7a32
--- /dev/null
+++ b/2015/10/part1.py
@@ -0,0 +1,42 @@
+with open("input") as f:
+    start_number = f.readline().strip()
+
+# start_number = "211"
+
+print("Start:", start_number)
+
+
+def generate_next_number(number):
+    next_number = ""
+    last_char = ""
+    char_count = 0
+
+    for char in number:
+        # initialize
+        if not last_char:
+            last_char = char
+            char_count = 1
+            continue
+
+        # same as last char: increase count
+        if char == last_char:
+            char_count += 1
+            continue
+
+        # different than last char: append to next_number and initialize
+        next_number = next_number + str(char_count) + last_char
+        char_count = 1
+        last_char = char
+
+    next_number = next_number + str(char_count) + last_char
+    return next_number
+
+
+for i in range(40):
+    print("Iteration:", i + 1)
+    prev_number = start_number
+    start_number = generate_next_number(start_number)
+    # print(f"{prev_number} -> {start_number}")
+
+print("Solution:")
+print(len(start_number))
diff --git a/2015/10/part2.py b/2015/10/part2.py
new file mode 100644
index 0000000..82d1277
--- /dev/null
+++ b/2015/10/part2.py
@@ -0,0 +1,41 @@
+from collections import defaultdict
+
+with open("input") as f:
+    start_number = f.readline().strip()
+
+print("Start:", start_number, "length:", len(start_number))
+
+ATOM_TO_NUMBER = dict()
+NUMBER_TO_ATOM = dict()
+DECAY = dict()
+
+# From https://web.archive.org/web/20061224154744/http://www.uam.es/personal_pdi/ciencias/omartin/Biochem.PDF
+with open("atoms") as f:
+    for line in f.readlines():
+        columns = line.strip().split(" ")
+        [_, atom, number] = columns[:3]
+        NUMBER_TO_ATOM[number] = atom
+        ATOM_TO_NUMBER[atom] = number
+        DECAY[atom] = columns[3:]
+
+start_atom = NUMBER_TO_ATOM[start_number]
+
+print("Starting with atom:", start_atom)
+
+ATOM_COUNT = defaultdict(int)
+ATOM_COUNT[start_atom] = 1
+
+for i in range(50):
+    NEXT_ATOM_COUNT = defaultdict(int)
+    for atom, count in ATOM_COUNT.items():
+        for new_atom in DECAY[atom]:
+            NEXT_ATOM_COUNT[new_atom] += count
+    ATOM_COUNT = NEXT_ATOM_COUNT
+
+    length = 0
+    for atom, count in ATOM_COUNT.items():
+        length += len(ATOM_TO_NUMBER[atom]) * count
+
+    print("Round", i + 1, "len:", length)
+
+print(length)
diff --git a/2015/11/input b/2015/11/input
new file mode 100644
index 0000000..988745d
--- /dev/null
+++ b/2015/11/input
@@ -0,0 +1 @@
+vzbxkghb
diff --git a/2015/11/part1.py b/2015/11/part1.py
new file mode 100644
index 0000000..81ac4eb
--- /dev/null
+++ b/2015/11/part1.py
@@ -0,0 +1,85 @@
+start_password = "vzbxkghb"
+# start_password = "abcdefgh"
+print("Start password:", start_password)
+
+
+def b26_to_int(input_string):
+    result = 0
+    exp = 1
+    for char in input_string[::-1]:
+        char_value = ord(char) - 97  # from 0 to 25
+        result += char_value * exp
+        exp *= 26
+    return result
+
+
+def int_to_b26(input_number):
+    result = ""
+    while input_number:
+        quot, remainder = divmod(input_number, 26)
+        result += chr(remainder + 97)
+        input_number = quot
+    return result[::-1]
+
+
+def increment_password(password):
+    return int_to_b26(b26_to_int(password) + 1).rjust(8, "a")
+
+
+STRAIGHTS = [chr(x + 97) + chr(x + 98) + chr(x + 99) for x in range(24)]
+
+
+def has_increasing_straight(password):
+    for straight in STRAIGHTS:
+        if straight in password:
+            return True
+    return False
+
+
+def has_forbidden_letter(password):
+    for char in ["i", "o", "l"]:
+        if char in password:
+            return True
+    return False
+
+
+PAIRS = [chr(x + 97) + chr(x + 97) for x in range(26)]
+
+
+def contains_two_pairs(password):
+    count_pairs = 0
+    for pair in PAIRS:
+        if pair in password:
+            count_pairs += 1
+        if count_pairs >= 2:
+            return True
+    return False
+
+
+def validate_password(password):
+    return (
+        has_increasing_straight(password)
+        and not has_forbidden_letter(password)
+        and contains_two_pairs(password)
+    )
+
+
+# to_int = b26_to_int(start_password)
+# print(start_password, to_int, int_to_b26(to_int))
+# print(start_password, increment_password(start_password))
+
+# for pwd in ["hijklmmn", "abbceffg", "abbcegjk", "abcdffaa", "ghjaabcc"]:
+#     print(pwd)
+#     print(validate_password(pwd))
+#     print()
+
+# print(STRAIGHTS)
+# print(PAIRS)
+
+
+while not validate_password(start_password):
+    start_password = increment_password(start_password)
+
+print(start_password)
+
+# false guess: vzcaabcc
diff --git a/2015/11/part2.py b/2015/11/part2.py
new file mode 100644
index 0000000..833ea45
--- /dev/null
+++ b/2015/11/part2.py
@@ -0,0 +1,90 @@
+start_password = "vzbxkghb"
+# start_password = "abcdefgh"
+print("Start password:", start_password)
+
+
+def b26_to_int(input_string):
+    result = 0
+    exp = 1
+    for char in input_string[::-1]:
+        char_value = ord(char) - 97  # from 0 to 25
+        result += char_value * exp
+        exp *= 26
+    return result
+
+
+def int_to_b26(input_number):
+    result = ""
+    while input_number:
+        quot, remainder = divmod(input_number, 26)
+        result += chr(remainder + 97)
+        input_number = quot
+    return result[::-1]
+
+
+def increment_password(password):
+    return int_to_b26(b26_to_int(password) + 1).rjust(8, "a")
+
+
+STRAIGHTS = [chr(x + 97) + chr(x + 98) + chr(x + 99) for x in range(24)]
+
+
+def has_increasing_straight(password):
+    for straight in STRAIGHTS:
+        if straight in password:
+            return True
+    return False
+
+
+def has_forbidden_letter(password):
+    for char in ["i", "o", "l"]:
+        if char in password:
+            return True
+    return False
+
+
+PAIRS = [chr(x + 97) + chr(x + 97) for x in range(26)]
+
+
+def contains_two_pairs(password):
+    count_pairs = 0
+    for pair in PAIRS:
+        if pair in password:
+            count_pairs += 1
+        if count_pairs >= 2:
+            return True
+    return False
+
+
+def validate_password(password):
+    return (
+        has_increasing_straight(password)
+        and not has_forbidden_letter(password)
+        and contains_two_pairs(password)
+    )
+
+
+# to_int = b26_to_int(start_password)
+# print(start_password, to_int, int_to_b26(to_int))
+# print(start_password, increment_password(start_password))
+
+# for pwd in ["hijklmmn", "abbceffg", "abbcegjk", "abcdffaa", "ghjaabcc"]:
+#     print(pwd)
+#     print(validate_password(pwd))
+#     print()
+
+# print(STRAIGHTS)
+# print(PAIRS)
+
+
+while not validate_password(start_password):
+    start_password = increment_password(start_password)
+
+start_password = increment_password(start_password)
+
+while not validate_password(start_password):
+    start_password = increment_password(start_password)
+
+print(start_password)
+
+# false guess: vzcaabcc
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diff --git a/2015/12/part1.py b/2015/12/part1.py
new file mode 100644
index 0000000..3069a2a
--- /dev/null
+++ b/2015/12/part1.py
@@ -0,0 +1,6 @@
+import re
+
+with open("input") as f:
+    document = f.readline().strip()
+
+print(sum([int(x) for x in re.findall(r"[0-9-]+", document)]))
diff --git a/2015/12/part2.py b/2015/12/part2.py
new file mode 100644
index 0000000..0f5cc7d
--- /dev/null
+++ b/2015/12/part2.py
@@ -0,0 +1,31 @@
+import json
+
+with open("input") as f:
+    document = f.readline().strip()
+
+document = json.loads(document)
+
+
+def iterate_object(json_object):
+    object_sum = 0
+    object_type = type(json_object)
+
+    if object_type == list:
+        for item in json_object:
+            object_sum += iterate_object(item)
+    elif object_type == int:
+        return json_object
+    elif object_type == str:
+        pass
+    elif object_type == dict:
+        for item in json_object.values():
+            if item == "red":
+                return 0
+            object_sum += iterate_object(item)
+    else:
+        raise TypeError(f"No case for type {object_type}!")
+
+    return object_sum
+
+
+print(iterate_object(document))
diff --git a/2015/13/input b/2015/13/input
new file mode 100644
index 0000000..35be357
--- /dev/null
+++ b/2015/13/input
@@ -0,0 +1,56 @@
+Alice would gain 54 happiness units by sitting next to Bob.
+Alice would lose 81 happiness units by sitting next to Carol.
+Alice would lose 42 happiness units by sitting next to David.
+Alice would gain 89 happiness units by sitting next to Eric.
+Alice would lose 89 happiness units by sitting next to Frank.
+Alice would gain 97 happiness units by sitting next to George.
+Alice would lose 94 happiness units by sitting next to Mallory.
+Bob would gain 3 happiness units by sitting next to Alice.
+Bob would lose 70 happiness units by sitting next to Carol.
+Bob would lose 31 happiness units by sitting next to David.
+Bob would gain 72 happiness units by sitting next to Eric.
+Bob would lose 25 happiness units by sitting next to Frank.
+Bob would lose 95 happiness units by sitting next to George.
+Bob would gain 11 happiness units by sitting next to Mallory.
+Carol would lose 83 happiness units by sitting next to Alice.
+Carol would gain 8 happiness units by sitting next to Bob.
+Carol would gain 35 happiness units by sitting next to David.
+Carol would gain 10 happiness units by sitting next to Eric.
+Carol would gain 61 happiness units by sitting next to Frank.
+Carol would gain 10 happiness units by sitting next to George.
+Carol would gain 29 happiness units by sitting next to Mallory.
+David would gain 67 happiness units by sitting next to Alice.
+David would gain 25 happiness units by sitting next to Bob.
+David would gain 48 happiness units by sitting next to Carol.
+David would lose 65 happiness units by sitting next to Eric.
+David would gain 8 happiness units by sitting next to Frank.
+David would gain 84 happiness units by sitting next to George.
+David would gain 9 happiness units by sitting next to Mallory.
+Eric would lose 51 happiness units by sitting next to Alice.
+Eric would lose 39 happiness units by sitting next to Bob.
+Eric would gain 84 happiness units by sitting next to Carol.
+Eric would lose 98 happiness units by sitting next to David.
+Eric would lose 20 happiness units by sitting next to Frank.
+Eric would lose 6 happiness units by sitting next to George.
+Eric would gain 60 happiness units by sitting next to Mallory.
+Frank would gain 51 happiness units by sitting next to Alice.
+Frank would gain 79 happiness units by sitting next to Bob.
+Frank would gain 88 happiness units by sitting next to Carol.
+Frank would gain 33 happiness units by sitting next to David.
+Frank would gain 43 happiness units by sitting next to Eric.
+Frank would gain 77 happiness units by sitting next to George.
+Frank would lose 3 happiness units by sitting next to Mallory.
+George would lose 14 happiness units by sitting next to Alice.
+George would lose 12 happiness units by sitting next to Bob.
+George would lose 52 happiness units by sitting next to Carol.
+George would gain 14 happiness units by sitting next to David.
+George would lose 62 happiness units by sitting next to Eric.
+George would lose 18 happiness units by sitting next to Frank.
+George would lose 17 happiness units by sitting next to Mallory.
+Mallory would lose 36 happiness units by sitting next to Alice.
+Mallory would gain 76 happiness units by sitting next to Bob.
+Mallory would lose 34 happiness units by sitting next to Carol.
+Mallory would gain 37 happiness units by sitting next to David.
+Mallory would gain 40 happiness units by sitting next to Eric.
+Mallory would gain 18 happiness units by sitting next to Frank.
+Mallory would gain 7 happiness units by sitting next to George.
diff --git a/2015/13/part1.py b/2015/13/part1.py
new file mode 100644
index 0000000..1f579fc
--- /dev/null
+++ b/2015/13/part1.py
@@ -0,0 +1,40 @@
+from itertools import permutations
+from collections import defaultdict
+
+with open("input") as f:
+    instructions = [n.strip() for n in f.readlines()]
+
+POINTS = defaultdict(int)
+PERSONS = set()
+
+for instruction in instructions:
+    person_a, _, sign, points, _, _, _, _, _, _, person_b = instruction.split(" ")
+    person_b = person_b.strip(".")
+    multiplicator = 1 if sign == "gain" else -1
+    points = int(points) * multiplicator
+
+    person_a, person_b = sorted([person_a, person_b])
+    POINTS[(person_a, person_b)] += points
+    PERSONS.add(person_a)
+    PERSONS.add(person_b)
+
+print("POINTS", POINTS)
+print("PERSONS", PERSONS)
+
+HIGHEST_POINTS = None
+SEATING_ORDER = None
+
+for seating_plan in permutations(PERSONS, len(PERSONS)):
+    points = 0
+    seating_plan = list(seating_plan)
+
+    for person_a, person_b in zip(seating_plan, seating_plan[1:] + seating_plan[:1]):
+        person_a, person_b = sorted([person_a, person_b])
+        points += POINTS[(person_a, person_b)]
+
+    if HIGHEST_POINTS is None or HIGHEST_POINTS < points:
+        HIGHEST_POINTS = points
+        SEATING_ORDER = seating_plan
+
+print("Best order:", SEATING_ORDER)
+print(HIGHEST_POINTS)
diff --git a/2015/13/part2.py b/2015/13/part2.py
new file mode 100644
index 0000000..e6ab997
--- /dev/null
+++ b/2015/13/part2.py
@@ -0,0 +1,42 @@
+from itertools import permutations
+from collections import defaultdict
+
+with open("input") as f:
+    instructions = [n.strip() for n in f.readlines()]
+
+POINTS = defaultdict(int)
+PERSONS = set()
+PERSONS.add("Me!")
+
+for instruction in instructions:
+    person_a, _, sign, points, _, _, _, _, _, _, person_b = instruction.split(" ")
+    person_b = person_b.strip(".")
+    multiplicator = 1 if sign == "gain" else -1
+    points = int(points) * multiplicator
+
+    person_a, person_b = sorted([person_a, person_b])
+    POINTS[(person_a, person_b)] += points
+    PERSONS.add(person_a)
+    PERSONS.add(person_b)
+
+print("POINTS", POINTS)
+print("PERSONS", PERSONS)
+print()
+
+HIGHEST_POINTS = None
+SEATING_ORDER = None
+
+for seating_plan in permutations(PERSONS, len(PERSONS)):
+    points = 0
+    seating_plan = list(seating_plan)
+
+    for person_a, person_b in zip(seating_plan, seating_plan[1:] + seating_plan[:1]):
+        person_a, person_b = sorted([person_a, person_b])
+        points += POINTS[(person_a, person_b)]
+
+    if HIGHEST_POINTS is None or HIGHEST_POINTS < points:
+        HIGHEST_POINTS = points
+        SEATING_ORDER = seating_plan
+
+print("Best order:", SEATING_ORDER)
+print(HIGHEST_POINTS)
diff --git a/2015/14/input b/2015/14/input
new file mode 100644
index 0000000..2af1170
--- /dev/null
+++ b/2015/14/input
@@ -0,0 +1,9 @@
+Vixen can fly 19 km/s for 7 seconds, but then must rest for 124 seconds.
+Rudolph can fly 3 km/s for 15 seconds, but then must rest for 28 seconds.
+Donner can fly 19 km/s for 9 seconds, but then must rest for 164 seconds.
+Blitzen can fly 19 km/s for 9 seconds, but then must rest for 158 seconds.
+Comet can fly 13 km/s for 7 seconds, but then must rest for 82 seconds.
+Cupid can fly 25 km/s for 6 seconds, but then must rest for 145 seconds.
+Dasher can fly 14 km/s for 3 seconds, but then must rest for 38 seconds.
+Dancer can fly 3 km/s for 16 seconds, but then must rest for 37 seconds.
+Prancer can fly 25 km/s for 6 seconds, but then must rest for 143 seconds.
diff --git a/2015/14/part1.py b/2015/14/part1.py
new file mode 100644
index 0000000..d02c0f8
--- /dev/null
+++ b/2015/14/part1.py
@@ -0,0 +1,28 @@
+import re
+
+with open("input") as f:
+    reindeers = [n.strip() for n in f.readlines()]
+
+TIME_ELAPSED = 2503
+
+max_distance = 0
+
+for reindeer in reindeers:
+    name = reindeer.split(" ")[0]
+    [speed, fly_time, rest_time] = [int(x) for x in re.findall("[0-9]+", reindeer)]
+
+    cycle = fly_time + rest_time
+    count_cycles, rest = divmod(TIME_ELAPSED, cycle)
+    rest = min(rest, fly_time)
+
+    distance = count_cycles * fly_time * speed + rest * speed
+
+    print(
+        f"{name.ljust(8)}: {speed}km/s for {fly_time}s, rest {rest_time}s -> {distance}km"
+    )
+
+    if distance > max_distance:
+        max_distance = distance
+
+print()
+print(max_distance)
diff --git a/2015/14/part2.py b/2015/14/part2.py
new file mode 100644
index 0000000..33fe628
--- /dev/null
+++ b/2015/14/part2.py
@@ -0,0 +1,54 @@
+import re
+from collections import defaultdict
+
+with open("input") as f:
+    lines = [n.strip() for n in f.readlines()]
+
+MAX_TIME = 2503
+# MAX_TIME = 1000
+
+
+def get_distance(speed, fly_time, rest_time, time_elapsed):
+    cycle = fly_time + rest_time
+    count_cycles, rest = divmod(time_elapsed, cycle)
+    rest = min(rest, fly_time)
+    distance = count_cycles * fly_time * speed + rest * speed
+    return distance
+
+
+reindeers = list()
+
+for line in lines:
+    name = line.split(" ")[0]
+    [speed, fly_time, rest_time] = [int(x) for x in re.findall("[0-9]+", line)]
+    reindeers.append((name, speed, fly_time, rest_time))
+
+# example:
+# reindeers = [("Comet", 14, 10, 127), ("Dancer", 16, 11, 162)]
+
+POINTS = defaultdict(int)
+
+for second in range(1, MAX_TIME + 1):
+    max_distance = None
+    leaders = []
+    for reindeer in reindeers:
+        name, speed, fly_time, rest_time = reindeer
+        distance = get_distance(speed, fly_time, rest_time, second)
+        if max_distance is None or distance > max_distance:
+            max_distance = distance
+            leaders = [name]
+        elif distance == max_distance:
+            leaders.append(name)
+
+    for leader in leaders:
+        POINTS[leader] += 1
+
+print("Standings:")
+for name, points in POINTS.items():
+    print(f"  {name.ljust(8)}: {points}")
+
+print()
+print("Winner points:")
+print(max(POINTS.values()))
+
+# 472: too low
diff --git a/2015/15/example b/2015/15/example
new file mode 100644
index 0000000..1a7ff25
--- /dev/null
+++ b/2015/15/example
@@ -0,0 +1,2 @@
+Butterscotch: capacity -1, durability -2, flavor 6, texture 3, calories 8
+Cinnamon: capacity 2, durability 3, flavor -2, texture -1, calories 3
diff --git a/2015/15/input b/2015/15/input
new file mode 100644
index 0000000..6281182
--- /dev/null
+++ b/2015/15/input
@@ -0,0 +1,4 @@
+Sprinkles: capacity 5, durability -1, flavor 0, texture 0, calories 5
+PeanutButter: capacity -1, durability 3, flavor 0, texture 0, calories 1
+Frosting: capacity 0, durability -1, flavor 4, texture 0, calories 6
+Sugar: capacity -1, durability 0, flavor 0, texture 2, calories 8
diff --git a/2015/15/part1.py b/2015/15/part1.py
new file mode 100644
index 0000000..85c12cc
--- /dev/null
+++ b/2015/15/part1.py
@@ -0,0 +1,68 @@
+import re
+import numpy as np
+
+# list of ingredients
+#   each line is an ingredient
+#   each col is the property
+INGREDIENTS = []
+
+with open("input") as f:
+    lines = [n.strip() for n in f.readlines()]
+
+for line in lines:
+    values = re.findall("-?[0-9]+", line)
+    values = [int(x) for x in values]
+    INGREDIENTS.append(values)
+
+NUM_INGREDIENTS = len(INGREDIENTS)
+NUM_PROPERTIES = len(INGREDIENTS[0])
+
+# list of properties
+#   each line is a property
+#   ech col is theingredient
+PROPERTIES = np.zeros((NUM_PROPERTIES, NUM_INGREDIENTS))
+for idx_a, values in enumerate(INGREDIENTS):
+    for idx_b, value in enumerate(values):
+        PROPERTIES[idx_b][idx_a] = value
+
+
+print(INGREDIENTS)
+print(PROPERTIES)
+
+max_score = 0
+amounts = None
+
+for a in range(0, 101):
+    print(a)
+    for b in range(0, 101 - a):
+        for c in range(0, 101 - (a + b)):
+            for d in range(0, 101 - (a + b + c)):
+                score = 1
+                multipliers = [a, b, c, d]
+                for prop in PROPERTIES[:-1]:
+                    prop_sum = sum([a * b for a, b in zip(prop, multipliers)])
+                    if prop_sum < 0:
+                        prop_sum = 0
+                    score *= prop_sum
+
+                if score > max_score:
+                    max_score = score
+                    amounts = [a, b, c, d]
+                    # print("New leader:", score, amounts)
+
+print("finish")
+print(int(max_score))
+print(amounts)
+
+multipliers = amounts
+score = 1
+for prop in PROPERTIES:
+    prop_sum = sum([a * b for a, b in zip(prop, multipliers)])
+    if prop_sum < 0:
+        prop_sum = 0
+    score *= prop_sum
+    print("score", prop_sum)
+
+
+# 35087450112 too high [0, 0, ?, ?]
+# 6211814400 too high [28, 32, 18, 22]
diff --git a/2015/15/part2.py b/2015/15/part2.py
new file mode 100644
index 0000000..5197992
--- /dev/null
+++ b/2015/15/part2.py
@@ -0,0 +1,71 @@
+import re
+import numpy as np
+
+# list of ingredients
+#   each line is an ingredient
+#   each col is the property
+INGREDIENTS = []
+
+with open("input") as f:
+    lines = [n.strip() for n in f.readlines()]
+
+for line in lines:
+    values = re.findall("-?[0-9]+", line)
+    values = [int(x) for x in values]
+    INGREDIENTS.append(values)
+
+NUM_INGREDIENTS = len(INGREDIENTS)
+NUM_PROPERTIES = len(INGREDIENTS[0])
+
+# list of properties
+#   each line is a property
+#   ech col is theingredient
+PROPERTIES = np.zeros((NUM_PROPERTIES, NUM_INGREDIENTS))
+for idx_a, values in enumerate(INGREDIENTS):
+    for idx_b, value in enumerate(values):
+        PROPERTIES[idx_b][idx_a] = value
+
+
+print(INGREDIENTS)
+print(PROPERTIES)
+
+max_score = 0
+amounts = None
+
+for a in range(0, 101):
+    print(a)
+    for b in range(0, 101 - a):
+        for c in range(0, 101 - (a + b)):
+            for d in range(0, 101 - (a + b + c)):
+                score = 1
+                multipliers = [a, b, c, d]
+                calorie_sum = sum([a * b for a, b in zip(PROPERTIES[-1], multipliers)])
+                if calorie_sum != 500:
+                    continue
+                for prop in PROPERTIES[:-1]:
+                    prop_sum = sum([a * b for a, b in zip(prop, multipliers)])
+                    if prop_sum < 0:
+                        prop_sum = 0
+                    score *= prop_sum
+
+                if score > max_score:
+                    max_score = score
+                    amounts = [a, b, c, d]
+                    # print("New leader:", score, amounts)
+
+print("finish")
+print(int(max_score))
+print(amounts)
+
+multipliers = amounts
+score = 1
+for prop in PROPERTIES:
+    prop_sum = sum([a * b for a, b in zip(prop, multipliers)])
+    if prop_sum < 0:
+        prop_sum = 0
+    score *= prop_sum
+    print("score", prop_sum)
+
+
+# 35087450112 too high [0, 0, ?, ?]
+# 6211814400 too high [28, 32, 18, 22]
diff --git a/2015/16/components b/2015/16/components
new file mode 100644
index 0000000..ab4a9e4
--- /dev/null
+++ b/2015/16/components
@@ -0,0 +1,10 @@
+children: 3
+cats: 7
+samoyeds: 2
+pomeranians: 3
+akitas: 0
+vizslas: 0
+goldfish: 5
+trees: 3
+cars: 2
+perfumes: 1
diff --git a/2015/16/input b/2015/16/input
new file mode 100644
index 0000000..92ed31c
--- /dev/null
+++ b/2015/16/input
@@ -0,0 +1,500 @@
+Sue 1: goldfish: 6, trees: 9, akitas: 0
+Sue 2: goldfish: 7, trees: 1, akitas: 0
+Sue 3: cars: 10, akitas: 6, perfumes: 7
+Sue 4: perfumes: 2, vizslas: 0, cars: 6
+Sue 5: goldfish: 1, trees: 3, perfumes: 10
+Sue 6: children: 9, vizslas: 7, cars: 9
+Sue 7: cars: 6, vizslas: 5, cats: 3
+Sue 8: akitas: 10, vizslas: 9, children: 3
+Sue 9: vizslas: 8, cats: 2, trees: 1
+Sue 10: perfumes: 10, trees: 6, cars: 4
+Sue 11: cars: 9, children: 1, cats: 1
+Sue 12: pomeranians: 4, akitas: 6, goldfish: 8
+Sue 13: cats: 10, children: 5, trees: 9
+Sue 14: perfumes: 8, vizslas: 3, samoyeds: 1
+Sue 15: vizslas: 2, perfumes: 8, trees: 3
+Sue 16: pomeranians: 10, trees: 9, samoyeds: 4
+Sue 17: akitas: 7, vizslas: 0, goldfish: 6
+Sue 18: trees: 5, vizslas: 9, cars: 0
+Sue 19: akitas: 3, goldfish: 9, trees: 10
+Sue 20: perfumes: 7, samoyeds: 3, vizslas: 10
+Sue 21: perfumes: 7, pomeranians: 10, akitas: 8
+Sue 22: vizslas: 6, trees: 8, akitas: 10
+Sue 23: goldfish: 0, trees: 4, children: 9
+Sue 24: goldfish: 7, pomeranians: 9, akitas: 4
+Sue 25: cars: 7, trees: 4, pomeranians: 4
+Sue 26: trees: 9, akitas: 9, pomeranians: 7
+Sue 27: samoyeds: 0, perfumes: 9, goldfish: 10
+Sue 28: cars: 5, trees: 7, vizslas: 1
+Sue 29: perfumes: 9, trees: 1, children: 6
+Sue 30: goldfish: 10, trees: 0, cars: 4
+Sue 31: akitas: 2, perfumes: 5, goldfish: 5
+Sue 32: goldfish: 0, akitas: 5, trees: 0
+Sue 33: vizslas: 2, akitas: 2, samoyeds: 3
+Sue 34: goldfish: 8, perfumes: 5, cars: 3
+Sue 35: akitas: 1, cats: 4, trees: 9
+Sue 36: cars: 4, vizslas: 4, goldfish: 7
+Sue 37: akitas: 5, perfumes: 7, trees: 3
+Sue 38: goldfish: 10, trees: 2, vizslas: 9
+Sue 39: goldfish: 4, pomeranians: 5, vizslas: 5
+Sue 40: perfumes: 5, samoyeds: 4, akitas: 6
+Sue 41: goldfish: 9, cars: 4, perfumes: 5
+Sue 42: trees: 6, pomeranians: 9, goldfish: 8
+Sue 43: perfumes: 7, pomeranians: 1, akitas: 2
+Sue 44: vizslas: 9, cars: 5, cats: 0
+Sue 45: akitas: 1, goldfish: 6, trees: 0
+Sue 46: akitas: 5, vizslas: 8, trees: 2
+Sue 47: trees: 9, akitas: 2, vizslas: 9
+Sue 48: goldfish: 10, trees: 5, akitas: 2
+Sue 49: cars: 7, vizslas: 2, perfumes: 6
+Sue 50: akitas: 5, goldfish: 6, perfumes: 0
+Sue 51: cars: 9, cats: 7, trees: 5
+Sue 52: akitas: 7, goldfish: 10, cars: 0
+Sue 53: cars: 10, cats: 4, perfumes: 2
+Sue 54: goldfish: 2, pomeranians: 5, perfumes: 10
+Sue 55: vizslas: 5, akitas: 4, cars: 8
+Sue 56: goldfish: 9, vizslas: 4, akitas: 5
+Sue 57: perfumes: 8, samoyeds: 7, cars: 9
+Sue 58: cars: 5, akitas: 7, perfumes: 8
+Sue 59: samoyeds: 8, cars: 10, vizslas: 10
+Sue 60: akitas: 6, samoyeds: 0, goldfish: 3
+Sue 61: trees: 8, pomeranians: 0, akitas: 2
+Sue 62: trees: 1, perfumes: 3, vizslas: 4
+Sue 63: vizslas: 6, samoyeds: 9, goldfish: 8
+Sue 64: goldfish: 7, trees: 6, vizslas: 3
+Sue 65: cars: 1, vizslas: 0, akitas: 6
+Sue 66: cats: 6, pomeranians: 4, cars: 9
+Sue 67: trees: 10, pomeranians: 7, samoyeds: 3
+Sue 68: pomeranians: 5, goldfish: 9, akitas: 1
+Sue 69: akitas: 1, vizslas: 0, trees: 9
+Sue 70: cats: 4, goldfish: 4, vizslas: 10
+Sue 71: vizslas: 7, perfumes: 7, trees: 8
+Sue 72: children: 2, vizslas: 9, cats: 3
+Sue 73: cars: 8, pomeranians: 0, perfumes: 6
+Sue 74: akitas: 1, pomeranians: 8, vizslas: 10
+Sue 75: vizslas: 5, perfumes: 5, cars: 7
+Sue 76: cars: 3, vizslas: 3, goldfish: 0
+Sue 77: akitas: 9, samoyeds: 1, pomeranians: 3
+Sue 78: trees: 0, vizslas: 0, akitas: 6
+Sue 79: pomeranians: 9, cars: 1, perfumes: 0
+Sue 80: perfumes: 10, trees: 1, cats: 0
+Sue 81: goldfish: 5, akitas: 9, trees: 0
+Sue 82: vizslas: 1, akitas: 6, children: 4
+Sue 83: samoyeds: 7, perfumes: 8, pomeranians: 4
+Sue 84: perfumes: 3, children: 3, cats: 7
+Sue 85: goldfish: 9, trees: 3, cars: 9
+Sue 86: cars: 0, perfumes: 9, vizslas: 0
+Sue 87: children: 3, trees: 4, akitas: 3
+Sue 88: trees: 1, samoyeds: 1, goldfish: 0
+Sue 89: akitas: 8, cars: 3, vizslas: 9
+Sue 90: pomeranians: 9, trees: 9, goldfish: 8
+Sue 91: goldfish: 7, trees: 10, children: 0
+Sue 92: cats: 9, cars: 7, perfumes: 7
+Sue 93: vizslas: 2, goldfish: 7, cats: 9
+Sue 94: akitas: 5, cars: 8, vizslas: 4
+Sue 95: goldfish: 7, vizslas: 1, perfumes: 2
+Sue 96: goldfish: 5, trees: 6, perfumes: 10
+Sue 97: trees: 0, perfumes: 7, cars: 0
+Sue 98: cars: 2, perfumes: 6, trees: 8
+Sue 99: trees: 10, children: 7, cats: 9
+Sue 100: samoyeds: 5, goldfish: 6, vizslas: 6
+Sue 101: cars: 10, perfumes: 9, vizslas: 3
+Sue 102: pomeranians: 6, trees: 1, samoyeds: 4
+Sue 103: cars: 2, perfumes: 1, goldfish: 5
+Sue 104: goldfish: 2, cars: 8, pomeranians: 2
+Sue 105: goldfish: 6, vizslas: 0, trees: 10
+Sue 106: trees: 10, akitas: 10, pomeranians: 0
+Sue 107: vizslas: 2, pomeranians: 10, trees: 3
+Sue 108: children: 3, vizslas: 8, akitas: 7
+Sue 109: perfumes: 2, akitas: 2, samoyeds: 3
+Sue 110: goldfish: 7, trees: 1, perfumes: 1
+Sue 111: akitas: 2, cars: 9, perfumes: 2
+Sue 112: children: 10, cars: 0, akitas: 3
+Sue 113: akitas: 9, vizslas: 4, children: 3
+Sue 114: pomeranians: 3, trees: 2, goldfish: 5
+Sue 115: perfumes: 8, cars: 6, trees: 0
+Sue 116: samoyeds: 6, children: 3, pomeranians: 1
+Sue 117: goldfish: 1, trees: 2, akitas: 1
+Sue 118: goldfish: 10, akitas: 10, samoyeds: 0
+Sue 119: vizslas: 10, perfumes: 6, cars: 0
+Sue 120: cars: 2, perfumes: 9, goldfish: 5
+Sue 121: vizslas: 2, trees: 2, cars: 6
+Sue 122: vizslas: 3, trees: 0, akitas: 2
+Sue 123: akitas: 5, samoyeds: 7, goldfish: 1
+Sue 124: goldfish: 8, samoyeds: 7, trees: 8
+Sue 125: trees: 3, goldfish: 8, perfumes: 5
+Sue 126: cats: 3, vizslas: 9, goldfish: 0
+Sue 127: pomeranians: 9, goldfish: 3, perfumes: 6
+Sue 128: vizslas: 4, cars: 8, goldfish: 5
+Sue 129: vizslas: 8, children: 5, perfumes: 8
+Sue 130: cars: 7, children: 7, cats: 3
+Sue 131: perfumes: 1, akitas: 8, vizslas: 9
+Sue 132: perfumes: 7, samoyeds: 10, pomeranians: 6
+Sue 133: cars: 5, perfumes: 3, goldfish: 7
+Sue 134: perfumes: 9, akitas: 2, cats: 3
+Sue 135: perfumes: 1, trees: 9, vizslas: 9
+Sue 136: akitas: 7, cars: 3, perfumes: 7
+Sue 137: vizslas: 9, goldfish: 8, cars: 5
+Sue 138: trees: 0, samoyeds: 1, cars: 3
+Sue 139: cars: 0, perfumes: 6, trees: 0
+Sue 140: pomeranians: 4, cars: 1, perfumes: 7
+Sue 141: vizslas: 10, akitas: 8, cats: 3
+Sue 142: trees: 1, cats: 6, vizslas: 5
+Sue 143: pomeranians: 9, cars: 7, perfumes: 9
+Sue 144: cars: 0, perfumes: 2, pomeranians: 1
+Sue 145: trees: 1, goldfish: 9, perfumes: 8
+Sue 146: cars: 8, children: 5, vizslas: 2
+Sue 147: perfumes: 2, goldfish: 5, cars: 0
+Sue 148: akitas: 2, perfumes: 7, pomeranians: 6
+Sue 149: goldfish: 8, cars: 0, trees: 1
+Sue 150: akitas: 6, perfumes: 5, trees: 0
+Sue 151: vizslas: 6, samoyeds: 8, akitas: 10
+Sue 152: trees: 7, akitas: 7, perfumes: 6
+Sue 153: goldfish: 9, cats: 9, cars: 3
+Sue 154: vizslas: 10, trees: 0, cars: 9
+Sue 155: perfumes: 3, children: 2, goldfish: 1
+Sue 156: goldfish: 7, perfumes: 5, akitas: 6
+Sue 157: cats: 10, trees: 1, goldfish: 0
+Sue 158: cats: 7, children: 7, vizslas: 6
+Sue 159: perfumes: 9, akitas: 0, cars: 0
+Sue 160: akitas: 3, goldfish: 10, pomeranians: 2
+Sue 161: goldfish: 10, cars: 6, perfumes: 3
+Sue 162: trees: 0, cars: 9, goldfish: 1
+Sue 163: cars: 8, perfumes: 9, vizslas: 5
+Sue 164: goldfish: 1, trees: 10, children: 6
+Sue 165: goldfish: 0, vizslas: 6, cars: 0
+Sue 166: akitas: 5, vizslas: 1, cars: 5
+Sue 167: vizslas: 1, samoyeds: 1, children: 4
+Sue 168: samoyeds: 7, vizslas: 7, akitas: 3
+Sue 169: goldfish: 3, cats: 9, trees: 2
+Sue 170: cars: 5, perfumes: 9, vizslas: 5
+Sue 171: goldfish: 7, cars: 6, perfumes: 10
+Sue 172: cats: 6, akitas: 1, children: 6
+Sue 173: cats: 4, goldfish: 1, children: 3
+Sue 174: cars: 2, pomeranians: 2, vizslas: 7
+Sue 175: trees: 0, children: 4, goldfish: 7
+Sue 176: children: 8, cars: 5, cats: 9
+Sue 177: pomeranians: 4, vizslas: 7, trees: 3
+Sue 178: vizslas: 6, perfumes: 10, akitas: 6
+Sue 179: cars: 4, akitas: 4, trees: 4
+Sue 180: akitas: 8, goldfish: 6, trees: 9
+Sue 181: perfumes: 3, vizslas: 10, cars: 3
+Sue 182: vizslas: 3, samoyeds: 3, goldfish: 7
+Sue 183: goldfish: 10, perfumes: 2, cats: 1
+Sue 184: goldfish: 5, trees: 1, perfumes: 1
+Sue 185: vizslas: 10, trees: 9, perfumes: 2
+Sue 186: goldfish: 6, perfumes: 9, trees: 1
+Sue 187: cars: 0, trees: 9, goldfish: 6
+Sue 188: cars: 0, trees: 1, vizslas: 9
+Sue 189: akitas: 7, vizslas: 2, trees: 0
+Sue 190: pomeranians: 5, perfumes: 8, akitas: 10
+Sue 191: vizslas: 5, akitas: 3, cats: 0
+Sue 192: children: 1, trees: 1, cars: 2
+Sue 193: cars: 3, goldfish: 9, trees: 2
+Sue 194: samoyeds: 3, akitas: 4, perfumes: 8
+Sue 195: trees: 1, vizslas: 8, akitas: 10
+Sue 196: akitas: 6, cars: 5, pomeranians: 0
+Sue 197: akitas: 5, vizslas: 5, cats: 1
+Sue 198: trees: 4, cars: 6, goldfish: 6
+Sue 199: cats: 7, cars: 5, goldfish: 6
+Sue 200: vizslas: 4, cats: 0, akitas: 9
+Sue 201: pomeranians: 1, perfumes: 4, children: 2
+Sue 202: cats: 1, perfumes: 4, vizslas: 3
+Sue 203: vizslas: 1, akitas: 9, children: 5
+Sue 204: perfumes: 8, cars: 7, trees: 4
+Sue 205: perfumes: 7, pomeranians: 5, cats: 9
+Sue 206: vizslas: 8, trees: 2, akitas: 2
+Sue 207: akitas: 6, vizslas: 2, perfumes: 10
+Sue 208: vizslas: 1, children: 7, akitas: 4
+Sue 209: perfumes: 4, trees: 2, children: 1
+Sue 210: goldfish: 0, vizslas: 2, samoyeds: 10
+Sue 211: cars: 8, perfumes: 3, trees: 1
+Sue 212: cars: 8, samoyeds: 5, pomeranians: 8
+Sue 213: akitas: 2, goldfish: 8, pomeranians: 2
+Sue 214: akitas: 6, pomeranians: 2, cars: 0
+Sue 215: trees: 10, pomeranians: 4, vizslas: 0
+Sue 216: perfumes: 0, cars: 8, trees: 0
+Sue 217: samoyeds: 8, akitas: 7, children: 10
+Sue 218: perfumes: 1, vizslas: 6, children: 0
+Sue 219: children: 1, goldfish: 4, trees: 1
+Sue 220: akitas: 10, goldfish: 10, trees: 5
+Sue 221: cars: 7, pomeranians: 6, perfumes: 3
+Sue 222: vizslas: 6, children: 0, akitas: 5
+Sue 223: perfumes: 9, cars: 1, trees: 6
+Sue 224: pomeranians: 1, trees: 0, vizslas: 0
+Sue 225: goldfish: 8, akitas: 4, perfumes: 10
+Sue 226: pomeranians: 7, cats: 7, children: 4
+Sue 227: trees: 0, akitas: 2, perfumes: 1
+Sue 228: vizslas: 6, cars: 10, perfumes: 9
+Sue 229: cars: 0, perfumes: 6, trees: 4
+Sue 230: pomeranians: 7, perfumes: 5, trees: 2
+Sue 231: goldfish: 9, cars: 6, trees: 7
+Sue 232: akitas: 1, vizslas: 5, cars: 3
+Sue 233: akitas: 7, samoyeds: 2, vizslas: 5
+Sue 234: akitas: 6, cats: 8, pomeranians: 0
+Sue 235: pomeranians: 5, akitas: 5, vizslas: 3
+Sue 236: goldfish: 5, trees: 6, akitas: 5
+Sue 237: goldfish: 9, perfumes: 5, cats: 5
+Sue 238: cats: 8, goldfish: 4, perfumes: 0
+Sue 239: samoyeds: 8, children: 6, pomeranians: 6
+Sue 240: akitas: 4, samoyeds: 10, trees: 8
+Sue 241: trees: 2, goldfish: 8, cars: 1
+Sue 242: perfumes: 2, cars: 0, akitas: 10
+Sue 243: pomeranians: 1, cars: 7, trees: 2
+Sue 244: trees: 9, vizslas: 2, akitas: 10
+Sue 245: cars: 9, pomeranians: 4, trees: 0
+Sue 246: cars: 9, pomeranians: 7, perfumes: 1
+Sue 247: trees: 0, goldfish: 1, akitas: 8
+Sue 248: vizslas: 1, cats: 4, akitas: 4
+Sue 249: cats: 6, children: 4, goldfish: 9
+Sue 250: vizslas: 1, cars: 10, samoyeds: 5
+Sue 251: cars: 0, goldfish: 1, vizslas: 7
+Sue 252: cars: 7, akitas: 9, vizslas: 10
+Sue 253: akitas: 7, vizslas: 2, perfumes: 5
+Sue 254: vizslas: 10, akitas: 5, samoyeds: 0
+Sue 255: pomeranians: 8, goldfish: 0, cats: 6
+Sue 256: cars: 10, goldfish: 8, vizslas: 9
+Sue 257: goldfish: 3, perfumes: 9, cats: 3
+Sue 258: trees: 6, goldfish: 6, cars: 6
+Sue 259: trees: 0, goldfish: 2, perfumes: 8
+Sue 260: trees: 5, akitas: 0, cars: 0
+Sue 261: pomeranians: 9, goldfish: 7, perfumes: 8
+Sue 262: perfumes: 8, vizslas: 6, goldfish: 2
+Sue 263: vizslas: 6, trees: 5, goldfish: 9
+Sue 264: vizslas: 4, perfumes: 7, cars: 9
+Sue 265: goldfish: 10, trees: 3, perfumes: 1
+Sue 266: trees: 10, akitas: 8, goldfish: 8
+Sue 267: goldfish: 4, trees: 0, samoyeds: 9
+Sue 268: vizslas: 1, trees: 0, goldfish: 8
+Sue 269: cars: 2, perfumes: 10, goldfish: 5
+Sue 270: perfumes: 7, cars: 2, vizslas: 1
+Sue 271: cars: 6, perfumes: 10, goldfish: 6
+Sue 272: samoyeds: 4, goldfish: 2, vizslas: 9
+Sue 273: perfumes: 4, goldfish: 4, vizslas: 1
+Sue 274: children: 4, cars: 4, perfumes: 3
+Sue 275: children: 8, vizslas: 3, trees: 2
+Sue 276: vizslas: 5, children: 7, perfumes: 3
+Sue 277: perfumes: 3, cats: 4, vizslas: 5
+Sue 278: cars: 1, samoyeds: 10, akitas: 2
+Sue 279: trees: 9, perfumes: 9, cars: 10
+Sue 280: vizslas: 5, trees: 0, perfumes: 6
+Sue 281: vizslas: 3, akitas: 10, pomeranians: 7
+Sue 282: trees: 1, children: 2, akitas: 8
+Sue 283: akitas: 9, goldfish: 6, cats: 5
+Sue 284: cars: 9, children: 10, pomeranians: 2
+Sue 285: pomeranians: 0, perfumes: 4, cars: 7
+Sue 286: perfumes: 0, vizslas: 10, akitas: 10
+Sue 287: cats: 2, perfumes: 3, trees: 5
+Sue 288: akitas: 9, vizslas: 8, samoyeds: 9
+Sue 289: perfumes: 6, children: 2, cars: 7
+Sue 290: akitas: 0, children: 5, cars: 5
+Sue 291: cars: 4, perfumes: 0, trees: 1
+Sue 292: cats: 0, cars: 8, perfumes: 6
+Sue 293: akitas: 9, cats: 5, children: 5
+Sue 294: akitas: 4, cars: 9, goldfish: 3
+Sue 295: cars: 2, akitas: 3, perfumes: 7
+Sue 296: perfumes: 4, cars: 7, goldfish: 10
+Sue 297: trees: 5, akitas: 8, vizslas: 1
+Sue 298: perfumes: 0, goldfish: 6, trees: 9
+Sue 299: perfumes: 6, samoyeds: 8, cars: 1
+Sue 300: goldfish: 10, perfumes: 4, akitas: 2
+Sue 301: cars: 3, trees: 0, goldfish: 8
+Sue 302: perfumes: 7, samoyeds: 2, vizslas: 7
+Sue 303: children: 10, goldfish: 7, perfumes: 2
+Sue 304: samoyeds: 8, vizslas: 2, cars: 1
+Sue 305: trees: 1, cats: 0, goldfish: 10
+Sue 306: trees: 4, perfumes: 2, cars: 7
+Sue 307: cars: 6, vizslas: 2, children: 6
+Sue 308: vizslas: 2, cars: 0, akitas: 7
+Sue 309: cars: 3, vizslas: 8, perfumes: 6
+Sue 310: goldfish: 7, perfumes: 7, vizslas: 3
+Sue 311: pomeranians: 10, trees: 2, cars: 0
+Sue 312: samoyeds: 2, vizslas: 9, akitas: 1
+Sue 313: cars: 4, pomeranians: 7, goldfish: 7
+Sue 314: akitas: 2, pomeranians: 9, samoyeds: 10
+Sue 315: akitas: 3, vizslas: 2, trees: 0
+Sue 316: cars: 0, perfumes: 4, pomeranians: 6
+Sue 317: akitas: 10, goldfish: 3, pomeranians: 7
+Sue 318: cars: 9, trees: 0, pomeranians: 9
+Sue 319: akitas: 3, vizslas: 7, children: 10
+Sue 320: vizslas: 0, akitas: 8, pomeranians: 4
+Sue 321: cars: 10, akitas: 9, vizslas: 3
+Sue 322: perfumes: 0, akitas: 8, vizslas: 6
+Sue 323: vizslas: 10, perfumes: 5, cars: 3
+Sue 324: akitas: 0, goldfish: 6, vizslas: 7
+Sue 325: perfumes: 9, vizslas: 5, pomeranians: 2
+Sue 326: vizslas: 6, goldfish: 10, pomeranians: 8
+Sue 327: vizslas: 10, cars: 1, akitas: 7
+Sue 328: trees: 1, perfumes: 10, cars: 10
+Sue 329: pomeranians: 5, samoyeds: 3, cars: 10
+Sue 330: akitas: 6, cars: 1, pomeranians: 4
+Sue 331: cars: 5, children: 2, trees: 0
+Sue 332: vizslas: 6, pomeranians: 1, perfumes: 0
+Sue 333: akitas: 7, trees: 1, cats: 9
+Sue 334: vizslas: 6, goldfish: 9, akitas: 7
+Sue 335: akitas: 3, samoyeds: 3, cars: 3
+Sue 336: samoyeds: 10, perfumes: 9, trees: 6
+Sue 337: vizslas: 2, cars: 9, akitas: 0
+Sue 338: akitas: 6, perfumes: 9, vizslas: 3
+Sue 339: cars: 3, samoyeds: 8, trees: 2
+Sue 340: cats: 7, perfumes: 8, cars: 9
+Sue 341: goldfish: 9, perfumes: 5, cars: 10
+Sue 342: trees: 0, akitas: 3, perfumes: 5
+Sue 343: perfumes: 2, children: 0, cars: 6
+Sue 344: goldfish: 8, trees: 8, perfumes: 0
+Sue 345: perfumes: 6, cars: 6, goldfish: 5
+Sue 346: vizslas: 8, trees: 1, cars: 6
+Sue 347: cars: 0, cats: 3, perfumes: 7
+Sue 348: children: 7, perfumes: 10, cars: 7
+Sue 349: pomeranians: 8, akitas: 5, children: 2
+Sue 350: perfumes: 9, pomeranians: 4, goldfish: 3
+Sue 351: perfumes: 8, pomeranians: 7, trees: 4
+Sue 352: samoyeds: 1, goldfish: 9, akitas: 8
+Sue 353: akitas: 6, goldfish: 10, vizslas: 8
+Sue 354: akitas: 7, cars: 2, goldfish: 6
+Sue 355: cars: 3, goldfish: 6, akitas: 5
+Sue 356: akitas: 2, goldfish: 9, pomeranians: 1
+Sue 357: goldfish: 10, cars: 6, pomeranians: 9
+Sue 358: trees: 0, children: 2, goldfish: 6
+Sue 359: samoyeds: 3, cars: 2, akitas: 4
+Sue 360: trees: 1, goldfish: 8, cars: 5
+Sue 361: akitas: 5, vizslas: 7, perfumes: 1
+Sue 362: cats: 5, vizslas: 9, children: 4
+Sue 363: goldfish: 9, perfumes: 3, vizslas: 9
+Sue 364: children: 7, samoyeds: 2, pomeranians: 10
+Sue 365: perfumes: 9, akitas: 10, pomeranians: 4
+Sue 366: cars: 10, trees: 3, cats: 4
+Sue 367: vizslas: 6, akitas: 10, perfumes: 5
+Sue 368: akitas: 9, vizslas: 9, children: 4
+Sue 369: goldfish: 8, trees: 2, perfumes: 5
+Sue 370: trees: 0, children: 4, cars: 8
+Sue 371: cats: 6, perfumes: 0, vizslas: 2
+Sue 372: akitas: 7, cars: 5, perfumes: 3
+Sue 373: cars: 0, perfumes: 4, pomeranians: 10
+Sue 374: akitas: 5, perfumes: 5, vizslas: 2
+Sue 375: goldfish: 7, trees: 10, pomeranians: 7
+Sue 376: cars: 8, trees: 1, pomeranians: 8
+Sue 377: cars: 0, akitas: 9, vizslas: 1
+Sue 378: akitas: 5, perfumes: 3, vizslas: 7
+Sue 379: trees: 2, goldfish: 8, pomeranians: 8
+Sue 380: akitas: 5, cars: 9, perfumes: 9
+Sue 381: cars: 2, perfumes: 6, trees: 3
+Sue 382: perfumes: 6, vizslas: 2, goldfish: 9
+Sue 383: akitas: 8, vizslas: 7, cats: 1
+Sue 384: akitas: 9, trees: 10, vizslas: 7
+Sue 385: cars: 0, perfumes: 7, vizslas: 2
+Sue 386: vizslas: 10, akitas: 4, perfumes: 9
+Sue 387: perfumes: 6, pomeranians: 5, samoyeds: 8
+Sue 388: vizslas: 10, trees: 9, goldfish: 9
+Sue 389: goldfish: 8, akitas: 4, perfumes: 10
+Sue 390: goldfish: 6, trees: 8, akitas: 1
+Sue 391: vizslas: 4, akitas: 10, goldfish: 7
+Sue 392: akitas: 1, vizslas: 6, samoyeds: 5
+Sue 393: trees: 6, cars: 3, akitas: 5
+Sue 394: goldfish: 9, trees: 3, cars: 5
+Sue 395: akitas: 6, samoyeds: 4, goldfish: 4
+Sue 396: akitas: 2, trees: 1, cats: 5
+Sue 397: cars: 0, children: 9, trees: 10
+Sue 398: pomeranians: 3, samoyeds: 9, goldfish: 10
+Sue 399: cars: 7, akitas: 4, goldfish: 8
+Sue 400: cars: 4, akitas: 5, vizslas: 4
+Sue 401: pomeranians: 5, akitas: 8, vizslas: 5
+Sue 402: cats: 7, cars: 6, goldfish: 6
+Sue 403: samoyeds: 8, perfumes: 4, cars: 5
+Sue 404: akitas: 10, goldfish: 4, trees: 2
+Sue 405: trees: 8, perfumes: 1, cars: 2
+Sue 406: trees: 0, perfumes: 9, pomeranians: 10
+Sue 407: perfumes: 4, trees: 7, goldfish: 3
+Sue 408: akitas: 1, perfumes: 3, cars: 5
+Sue 409: trees: 6, samoyeds: 3, cars: 9
+Sue 410: vizslas: 3, goldfish: 5, akitas: 7
+Sue 411: goldfish: 10, trees: 1, vizslas: 9
+Sue 412: cars: 0, akitas: 6, trees: 6
+Sue 413: goldfish: 7, trees: 0, cars: 3
+Sue 414: pomeranians: 10, samoyeds: 3, cars: 10
+Sue 415: perfumes: 6, trees: 9, cars: 4
+Sue 416: trees: 2, cars: 4, goldfish: 8
+Sue 417: goldfish: 2, cars: 9, cats: 5
+Sue 418: vizslas: 1, cars: 9, akitas: 0
+Sue 419: perfumes: 6, cats: 3, children: 9
+Sue 420: cats: 5, goldfish: 7, akitas: 9
+Sue 421: trees: 1, samoyeds: 6, pomeranians: 1
+Sue 422: trees: 10, goldfish: 6, children: 7
+Sue 423: cars: 8, goldfish: 7, vizslas: 3
+Sue 424: samoyeds: 9, akitas: 7, trees: 5
+Sue 425: akitas: 5, children: 4, perfumes: 9
+Sue 426: goldfish: 1, children: 9, cats: 2
+Sue 427: vizslas: 9, akitas: 7, goldfish: 9
+Sue 428: pomeranians: 7, akitas: 5, vizslas: 1
+Sue 429: vizslas: 7, goldfish: 7, cars: 9
+Sue 430: trees: 7, perfumes: 0, pomeranians: 5
+Sue 431: children: 9, perfumes: 5, vizslas: 7
+Sue 432: trees: 6, samoyeds: 7, cats: 1
+Sue 433: goldfish: 5, trees: 5, children: 6
+Sue 434: goldfish: 9, akitas: 7, cars: 3
+Sue 435: samoyeds: 10, perfumes: 2, cars: 0
+Sue 436: akitas: 5, pomeranians: 4, perfumes: 7
+Sue 437: vizslas: 5, cats: 6, perfumes: 5
+Sue 438: trees: 2, goldfish: 6, vizslas: 7
+Sue 439: samoyeds: 8, pomeranians: 10, goldfish: 1
+Sue 440: akitas: 6, children: 9, perfumes: 4
+Sue 441: cars: 2, goldfish: 9, children: 0
+Sue 442: goldfish: 7, cars: 2, vizslas: 8
+Sue 443: goldfish: 6, samoyeds: 3, perfumes: 2
+Sue 444: trees: 2, goldfish: 7, cars: 8
+Sue 445: trees: 2, pomeranians: 0, children: 0
+Sue 446: perfumes: 4, akitas: 4, goldfish: 6
+Sue 447: vizslas: 7, akitas: 9, cars: 3
+Sue 448: goldfish: 6, trees: 9, cars: 0
+Sue 449: samoyeds: 7, perfumes: 4, vizslas: 10
+Sue 450: akitas: 7, cars: 10, goldfish: 7
+Sue 451: goldfish: 4, children: 7, pomeranians: 4
+Sue 452: cats: 4, vizslas: 6, trees: 7
+Sue 453: cars: 1, trees: 10, goldfish: 9
+Sue 454: trees: 2, goldfish: 3, vizslas: 10
+Sue 455: pomeranians: 9, vizslas: 3, akitas: 2
+Sue 456: vizslas: 10, akitas: 2, goldfish: 1
+Sue 457: trees: 5, cats: 5, children: 8
+Sue 458: cars: 6, goldfish: 3, akitas: 9
+Sue 459: goldfish: 7, akitas: 2, cats: 7
+Sue 460: akitas: 1, cars: 5, children: 8
+Sue 461: cars: 8, perfumes: 0, goldfish: 6
+Sue 462: pomeranians: 6, cats: 2, perfumes: 6
+Sue 463: vizslas: 7, perfumes: 3, goldfish: 3
+Sue 464: akitas: 10, goldfish: 10, trees: 1
+Sue 465: vizslas: 0, akitas: 2, trees: 2
+Sue 466: perfumes: 6, akitas: 8, cars: 2
+Sue 467: goldfish: 1, cars: 10, perfumes: 3
+Sue 468: goldfish: 4, trees: 2, cars: 9
+Sue 469: perfumes: 6, pomeranians: 0, vizslas: 10
+Sue 470: samoyeds: 8, children: 0, akitas: 7
+Sue 471: children: 3, goldfish: 9, cats: 9
+Sue 472: samoyeds: 0, goldfish: 0, trees: 0
+Sue 473: trees: 3, goldfish: 4, vizslas: 1
+Sue 474: perfumes: 10, cars: 3, trees: 7
+Sue 475: akitas: 5, vizslas: 4, goldfish: 5
+Sue 476: children: 2, akitas: 7, vizslas: 3
+Sue 477: vizslas: 6, pomeranians: 9, trees: 6
+Sue 478: vizslas: 7, pomeranians: 6, akitas: 7
+Sue 479: trees: 2, perfumes: 2, children: 2
+Sue 480: cars: 8, cats: 5, vizslas: 0
+Sue 481: trees: 5, goldfish: 0, akitas: 3
+Sue 482: cars: 8, perfumes: 6, goldfish: 10
+Sue 483: goldfish: 0, cars: 3, perfumes: 10
+Sue 484: pomeranians: 1, samoyeds: 1, perfumes: 3
+Sue 485: trees: 0, akitas: 2, vizslas: 4
+Sue 486: cars: 3, vizslas: 8, goldfish: 1
+Sue 487: pomeranians: 9, vizslas: 2, children: 10
+Sue 488: akitas: 6, vizslas: 10, perfumes: 9
+Sue 489: goldfish: 6, vizslas: 4, cars: 2
+Sue 490: vizslas: 10, cats: 8, samoyeds: 1
+Sue 491: cats: 9, cars: 1, perfumes: 10
+Sue 492: goldfish: 6, cars: 9, pomeranians: 9
+Sue 493: children: 10, goldfish: 10, vizslas: 0
+Sue 494: pomeranians: 5, cars: 0, vizslas: 0
+Sue 495: vizslas: 7, perfumes: 6, samoyeds: 3
+Sue 496: trees: 1, cats: 4, cars: 10
+Sue 497: cats: 1, perfumes: 0, cars: 7
+Sue 498: perfumes: 7, vizslas: 6, cats: 9
+Sue 499: vizslas: 8, perfumes: 1, akitas: 3
+Sue 500: perfumes: 4, cars: 9, trees: 4
diff --git a/2015/16/part1.py b/2015/16/part1.py
new file mode 100644
index 0000000..2d948e8
--- /dev/null
+++ b/2015/16/part1.py
@@ -0,0 +1,39 @@
+with open("input") as f:
+    sues_raw = [n.strip() for n in f.readlines()]
+
+
+with open("components") as f:
+    components_raw = [n.strip() for n in f.readlines()]
+
+COMPONENTS = dict()
+for component in components_raw:
+    key, amount = component.split(":")
+    amount = int(amount)
+    COMPONENTS[key] = amount
+
+
+print(COMPONENTS)
+SUES = dict()
+
+for sue in sues_raw:
+    name, component_list = sue.split(":", 1)
+    component_list = [x.strip() for x in component_list.split(",")]
+    components = dict()
+    for component in component_list:
+        key, amount = component.split(":")
+        amount = int(amount)
+        components[key] = amount
+    SUES[name] = components
+
+
+def is_match(components):
+    for key, val in components.items():
+        if COMPONENTS[key] != val:
+            return False
+    return True
+
+
+print(SUES)
+for name, components in SUES.items():
+    if is_match(components):
+        print("Found:", name)
diff --git a/2015/16/part2.py b/2015/16/part2.py
new file mode 100644
index 0000000..2a0960d
--- /dev/null
+++ b/2015/16/part2.py
@@ -0,0 +1,47 @@
+with open("input") as f:
+    sues_raw = [n.strip() for n in f.readlines()]
+
+
+with open("components") as f:
+    components_raw = [n.strip() for n in f.readlines()]
+
+COMPONENTS = dict()
+for component in components_raw:
+    key, amount = component.split(":")
+    amount = int(amount)
+    COMPONENTS[key] = amount
+
+
+print(COMPONENTS)
+SUES = dict()
+
+for sue in sues_raw:
+    name, component_list = sue.split(":", 1)
+    component_list = [x.strip() for x in component_list.split(",")]
+    components = dict()
+    for component in component_list:
+        key, amount = component.split(":")
+        amount = int(amount)
+        components[key] = amount
+    SUES[name] = components
+
+
+def is_match(components):
+    for key, remembered_val in components.items():
+        measured_val = COMPONENTS[key]
+        if key in ["cats", "trees"]:
+            if not remembered_val > measured_val:
+                return False
+        elif key in ["pomeranians", "goldfish"]:
+            if not remembered_val < measured_val:
+                return False
+        elif remembered_val != measured_val:
+            return False
+    return True
+
+
+for name, components in SUES.items():
+    if is_match(components):
+        print("Found:", name)
+
+print("Finish")
diff --git a/2015/17/input b/2015/17/input
new file mode 100644
index 0000000..f796965
--- /dev/null
+++ b/2015/17/input
@@ -0,0 +1,20 @@
+11
+30
+47
+31
+32
+36
+3
+1
+5
+3
+32
+36
+15
+11
+46
+26
+28
+1
+19
+3
diff --git a/2015/17/part1.py b/2015/17/part1.py
new file mode 100644
index 0000000..59322e4
--- /dev/null
+++ b/2015/17/part1.py
@@ -0,0 +1,25 @@
+with open("input") as f:
+    jars = [int(n) for n in f.readlines()]
+
+jars.sort(reverse=True)
+
+
+def count_remaining_combinations(remaining_eggnog, remaining_jars):
+    if remaining_eggnog == 0:
+        return 1
+    if remaining_eggnog < 0:
+        return 0
+    if len(remaining_jars) == 0:
+        return 0
+
+    count = 0
+
+    for idx, jar in enumerate(remaining_jars):
+        count += count_remaining_combinations(
+            remaining_eggnog - jar, remaining_jars[idx + 1 :]
+        )
+
+    return count
+
+
+print(count_remaining_combinations(150, jars))
diff --git a/2015/17/part2.py b/2015/17/part2.py
new file mode 100644
index 0000000..2579a38
--- /dev/null
+++ b/2015/17/part2.py
@@ -0,0 +1,39 @@
+with open("input") as f:
+    jars = [int(n) for n in f.readlines()]
+
+jars.sort(reverse=True)
+
+combinations = []
+
+
+def count_remaining_combinations(remaining_eggnog, remaining_jars, used_jars):
+    if remaining_eggnog == 0:
+        combinations.append(used_jars)
+        return 1
+    if remaining_eggnog < 0:
+        return 0
+    if len(remaining_jars) == 0:
+        return 0
+
+    count = 0
+
+    for idx, jar in enumerate(remaining_jars):
+        count += count_remaining_combinations(
+            remaining_eggnog - jar, remaining_jars[idx + 1 :], used_jars + [jar]
+        )
+
+    return count
+
+
+count_remaining_combinations(150, jars, [])
+
+minimum_number_of_jars = min([len(x) for x in combinations])
+
+print("Minimum number of jars:", minimum_number_of_jars)
+
+minimal_comninations = [x for x in combinations if len(x) == minimum_number_of_jars]
+
+print(minimal_comninations)
+
+print("Count:")
+print(len(minimal_comninations))
diff --git a/2015/18/example b/2015/18/example
new file mode 100644
index 0000000..6ddce72
--- /dev/null
+++ b/2015/18/example
@@ -0,0 +1,6 @@
+.#.#.#
+...##.
+#....#
+..#...
+#.#..#
+####..
diff --git a/2015/18/input b/2015/18/input
new file mode 100644
index 0000000..5efaa1b
--- /dev/null
+++ b/2015/18/input
@@ -0,0 +1,100 @@
+#...##......#......##.##..#...##......##.#.#.###.#.#..#..#......####..#......###.#.#....#..##..###..
+####..#.#...#....#.#####.##.##.#..#.......#....#.##...###.###..#.#.#........#..#.#.##...##..#.####.#
+...#..##...#.#.###.#.###..#.##.####.###...#...........#.###..##.#.##.#.###...#.#..###....#.###.#..#.
+.#...##...####.#..#.....#..#...#.#.##...#...##..#.#.###....#..###.....##..#.###..###.....##..###...#
+..##.#####....##..#.#..##.##..######...#..###.######.....#..##...#.#..##..##..#..#..#..##.#.#.#.#...
+.###.###.###...##...##..###..##.###.#.....##..##.#.#########...##..##.#..##.#..##..####..#.#.#.#####
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+#..#.#..#...###.#..##.#...#...##.#......#...#..#..####..##.....#.###...#.#..#.#....#.#####.##.###...
+###....#.#..#.#..###..#.##......#...#..#..##.#..###..##..#..#.####..#...########..##.#.##.#.#.#...#.
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diff --git a/2015/18/part1.py b/2015/18/part1.py
new file mode 100644
index 0000000..d5ea26f
--- /dev/null
+++ b/2015/18/part1.py
@@ -0,0 +1,80 @@
+from time import sleep
+
+with open("input") as f:
+    lights = [n.strip() for n in f.readlines()]
+
+STEPS = 100
+# STEPS = 4
+
+X_MAX = len(lights)
+Y_MAX = len(lights[0])
+
+
+def print_lights():
+    for row in lights:
+        print(row)
+
+
+def neighbors_that_are_on(center_x, center_y):
+    count = 0
+    for d_x in range(-1, 2):
+        for d_y in range(-1, 2):
+            x = center_x + d_x
+            y = center_y + d_y
+            if d_x == 0 and d_y == 0:
+                continue
+            if x < 0 or x >= X_MAX:
+                continue
+            if y < 0 or y >= Y_MAX:
+                continue
+            neighbor = lights[x][y]
+            if neighbor == "#":
+                count += 1
+    return count
+
+
+def get_next_state(prev_state, neighbors_count):
+    if prev_state == "#":
+        if neighbors_count in [2, 3]:
+            return "#"
+        else:
+            return "."
+    else:  # light == '.'
+        if neighbors_count == 3:
+            return "#"
+        else:
+            return "."
+
+
+print("Initial state")
+print_lights()
+print()
+
+for step in range(STEPS):
+    new_lights = []
+
+    for x in range(X_MAX):
+        line = ""
+        for y in range(Y_MAX):
+            light = lights[x][y]
+            neighbors_count = neighbors_that_are_on(x, y)
+            next_state = get_next_state(light, neighbors_count)
+            line += next_state
+        new_lights.append(line)
+
+    lights = new_lights
+    print("Step", step + 1)
+    print_lights()
+    print()
+    sleep(0.03)
+
+
+count = 0
+for line in lights:
+    for light in line:
+        if light == "#":
+            count += 1
+
+print(count)
+
+# 353: too low
diff --git a/2015/18/part2.py b/2015/18/part2.py
new file mode 100644
index 0000000..48bd3a9
--- /dev/null
+++ b/2015/18/part2.py
@@ -0,0 +1,87 @@
+from time import sleep
+
+with open("input") as f:
+    lights = [n.strip() for n in f.readlines()]
+
+STEPS = 100
+# STEPS = 5
+
+X_MAX = len(lights)
+Y_MAX = len(lights[0])
+
+
+def print_lights():
+    for row in lights:
+        print(row)
+
+
+def neighbors_that_are_on(center_x, center_y):
+    count = 0
+    for d_x in range(-1, 2):
+        for d_y in range(-1, 2):
+            x = center_x + d_x
+            y = center_y + d_y
+            if d_x == 0 and d_y == 0:
+                continue
+            if x < 0 or x >= X_MAX:
+                continue
+            if y < 0 or y >= Y_MAX:
+                continue
+            neighbor = lights[x][y]
+            if neighbor == "#":
+                count += 1
+    return count
+
+
+def get_next_state(prev_state, neighbors_count):
+    if prev_state == "#":
+        if neighbors_count in [2, 3]:
+            return "#"
+        else:
+            return "."
+    else:  # light == '.'
+        if neighbors_count == 3:
+            return "#"
+        else:
+            return "."
+
+
+def turn_corners_on():
+    lights[0] = "#" + lights[0][1:-1] + "#"
+    lights[-1] = "#" + lights[-1][1:-1] + "#"
+
+
+print("Initial state")
+turn_corners_on()
+print_lights()
+print()
+
+for step in range(STEPS):
+    new_lights = []
+
+    for x in range(X_MAX):
+        line = ""
+        for y in range(Y_MAX):
+            light = lights[x][y]
+            neighbors_count = neighbors_that_are_on(x, y)
+            next_state = get_next_state(light, neighbors_count)
+            line += next_state
+        new_lights.append(line)
+
+    lights = new_lights
+    turn_corners_on()
+    print("Step", step + 1)
+    print_lights()
+    print()
+    sleep(0.03)
+
+
+count = 0
+for line in lights:
+    for light in line:
+        if light == "#":
+            count += 1
+
+print(count)
+
+# 353: too low
diff --git a/2015/19/example b/2015/19/example
new file mode 100644
index 0000000..f483a37
--- /dev/null
+++ b/2015/19/example
@@ -0,0 +1,7 @@
+e => H
+e => O
+H => HO
+H => OH
+O => HH
+
+HOH
diff --git a/2015/19/input b/2015/19/input
new file mode 100644
index 0000000..a245944
--- /dev/null
+++ b/2015/19/input
@@ -0,0 +1,45 @@
+Al => ThF
+Al => ThRnFAr
+B => BCa
+B => TiB
+B => TiRnFAr
+Ca => CaCa
+Ca => PB
+Ca => PRnFAr
+Ca => SiRnFYFAr
+Ca => SiRnMgAr
+Ca => SiTh
+F => CaF
+F => PMg
+F => SiAl
+H => CRnAlAr
+H => CRnFYFYFAr
+H => CRnFYMgAr
+H => CRnMgYFAr
+H => HCa
+H => NRnFYFAr
+H => NRnMgAr
+H => NTh
+H => OB
+H => ORnFAr
+Mg => BF
+Mg => TiMg
+N => CRnFAr
+N => HSi
+O => CRnFYFAr
+O => CRnMgAr
+O => HP
+O => NRnFAr
+O => OTi
+P => CaP
+P => PTi
+P => SiRnFAr
+Si => CaSi
+Th => ThCa
+Ti => BP
+Ti => TiTi
+e => HF
+e => NAl
+e => OMg
+
+CRnCaCaCaSiRnBPTiMgArSiRnSiRnMgArSiRnCaFArTiTiBSiThFYCaFArCaCaSiThCaPBSiThSiThCaCaPTiRnPBSiThRnFArArCaCaSiThCaSiThSiRnMgArCaPTiBPRnFArSiThCaSiRnFArBCaSiRnCaPRnFArPMgYCaFArCaPTiTiTiBPBSiThCaPTiBPBSiRnFArBPBSiRnCaFArBPRnSiRnFArRnSiRnBFArCaFArCaCaCaSiThSiThCaCaPBPTiTiRnFArCaPTiBSiAlArPBCaCaCaCaCaSiRnMgArCaSiThFArThCaSiThCaSiRnCaFYCaSiRnFYFArFArCaSiRnFYFArCaSiRnBPMgArSiThPRnFArCaSiRnFArTiRnSiRnFYFArCaSiRnBFArCaSiRnTiMgArSiThCaSiThCaFArPRnFArSiRnFArTiTiTiTiBCaCaSiRnCaCaFYFArSiThCaPTiBPTiBCaSiThSiRnMgArCaF
diff --git a/2015/19/part1.py b/2015/19/part1.py
new file mode 100644
index 0000000..19145ed
--- /dev/null
+++ b/2015/19/part1.py
@@ -0,0 +1,35 @@
+import re
+from collections import defaultdict
+
+
+def parse_atoms(molecule):
+    return re.findall(r"[A-Z][a-z]*", molecule)
+
+
+decay = defaultdict(list)
+
+with open("input") as f:
+    line = f.readline()
+    while line != "\n":
+        atom, decays_to = line.strip().split(" => ")
+        decay[atom].append(decays_to)
+        line = f.readline()
+
+    molecule = f.readline()
+
+print(decay)
+print()
+print(molecule)
+
+atoms = parse_atoms(molecule)
+
+next_molecules = set()
+
+for idx, atom in enumerate(atoms):
+    prefix = "".join(atoms[:idx])
+    suffix = "".join(atoms[idx + 1 :])
+    for decay_molecule in decay[atom]:
+        descendant = prefix + decay_molecule + suffix
+        next_molecules.add(descendant)
+
+print(len(next_molecules))
diff --git a/2015/19/part2.py b/2015/19/part2.py
new file mode 100644
index 0000000..0e5f477
--- /dev/null
+++ b/2015/19/part2.py
@@ -0,0 +1,63 @@
+import re
+from collections import defaultdict
+
+INPUT_FILENAME = "example"
+
+
+def parse_atoms(molecule):
+    """Return a list of all Atoms in the molecule string"""
+    return re.findall(r"[A-Z][a-z]*", molecule)
+
+
+ATOMS = set()
+REPLACEMENTS = list()
+
+with open(INPUT_FILENAME) as f:
+    line = f.readline()
+    while line != "\n":
+        atom, decays_to = line.strip().split(" => ")
+        REPLACEMENTS.append([atom, decays_to])
+        ATOMS.update(parse_atoms(decays_to))
+        ATOMS.add(atom)
+        line = f.readline()
+
+    MOLECULE = f.readline().strip()
+
+ATOMS.update(parse_atoms(MOLECULE))
+
+
+print("ATOMS", ATOMS)
+print()
+print("REPLACEMENTS", REPLACEMENTS)
+print()
+print("MOLECULE", MOLECULE)
+print()
+
+
+def shrink(molecule, from_molecule, to_atom, idx):
+    prefix = molecule[:idx]
+    suffix = molecule[idx + len(from_molecule) :]
+    return prefix + to_atom + suffix
+
+
+def step(molecule):
+    next_molecules = []
+    for (atom, decays_to) in REPLACEMENTS:
+        possible = [m.start() for m in re.finditer(decays_to, molecule)]
+        if not possible:
+            continue
+
+        print(decays_to, atom)
+
+        if atom == "e" and len(decays_to) != len(molecule):
+            continue
+
+        for idx in possible:
+            next_molecule = shrink(molecule, decays_to, atom, idx)
+            next_molecules.append(next_molecules)
+            print("    ", idx, next_molecule)
+
+    return next_molecules
+
+
+step(MOLECULE)
diff --git a/2015/20/input b/2015/20/input
new file mode 100644
index 0000000..282bc62
--- /dev/null
+++ b/2015/20/input
@@ -0,0 +1 @@
+33100000
diff --git a/2015/20/part1.py b/2015/20/part1.py
new file mode 100644
index 0000000..36e6239
--- /dev/null
+++ b/2015/20/part1.py
@@ -0,0 +1,79 @@
+import matplotlib.pyplot as plt
+
+INPUT = 33100000
+
+
+def get_divisors(num):
+    divisors = set()
+    divisors.add(1)
+    divisors.add(num)
+
+    upper_limit = num
+    lower_limit = 2
+
+    while lower_limit < upper_limit:
+        quotient, rest = divmod(num, lower_limit)
+        if rest == 0:
+            divisors.add(lower_limit)
+            divisors.add(quotient)
+        lower_limit += 1
+
+    return divisors
+
+
+def present_count(house_number):
+    divisors = get_divisors(house_number)
+    presents = 0
+    for divisor in divisors:
+        presents += divisor * 10
+    return presents
+
+
+X = []
+Y = []
+
+for x in range(1, 100):
+    if x % 100 == 0:
+        print(x)
+    y = present_count(x)
+    plt.plot(x, y, "bo")
+    plt.annotate(f"{x}", (x, y), xytext=(2, 0), textcoords="offset points")
+
+plt.show()
+
+print("Estimation...")
+prev_house_number = None
+house_number = 1
+presents = 10
+while True:
+    prev_house_number = house_number
+    house_number = house_number * 2
+    presents += house_number * 10
+    print(house_number, presents)
+
+    if presents > INPUT:
+        break
+
+lower_bound = prev_house_number
+upper_bound = house_number
+
+print("Estimation lower bound:", lower_bound)
+print("Estimation upper bound:", upper_bound)
+print()
+
+current = int(lower_bound + (upper_bound - lower_bound) / 2)
+
+loop_count = 0
+while True:
+    presents = present_count(current)
+    print("loop", current, lower_bound, upper_bound, presents)
+    if presents < INPUT:
+        lower_bound = current
+    else:
+        upper_bound = current
+
+    current = int(lower_bound + (upper_bound - lower_bound) / 2)
+
+print("finished")
+# 2097152 too high
+# 1540098 too high
diff --git a/2015/20/test.png b/2015/20/test.png
new file mode 100644
index 0000000..cbe4dbc
Binary files /dev/null and b/2015/20/test.png differ
diff --git a/2015/21/input b/2015/21/input
new file mode 100644
index 0000000..e749051
--- /dev/null
+++ b/2015/21/input
@@ -0,0 +1,3 @@
+Hit Points: 103
+Damage: 9
+Armor: 2
diff --git a/2020/24/example b/2020/24/example
new file mode 100644
index 0000000..3dc2f67
--- /dev/null
+++ b/2020/24/example
@@ -0,0 +1,20 @@
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+eneswnwswnwsenenwnwnwwseeswneewsenese
+neswnwewnwnwseenwseesewsenwsweewe
+wseweeenwnesenwwwswnew
diff --git a/2020/24/input b/2020/24/input
new file mode 100644
index 0000000..9b35a80
--- /dev/null
+++ b/2020/24/input
@@ -0,0 +1,471 @@
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diff --git a/2020/24/solution.py b/2020/24/solution.py
new file mode 100644
index 0000000..5a3b391
--- /dev/null
+++ b/2020/24/solution.py
@@ -0,0 +1,83 @@
+"""Solution for 2020/24"""
+
+from collections import defaultdict
+
+instructions = []
+with open('input', 'r') as f:
+    for line in f.readlines():
+        line = line.strip()
+        i = 0
+        instruction = []
+        while i < len(line):
+            if line[i] in ['w', 'e']:
+                instruction.append(line[i])
+            else:
+                instruction.append(line[i:i+2])
+                i += 1
+            i += 1
+        instructions.append(instruction)
+
+
+print(instructions)
+
+MOVEMENTS = {
+    'e': (1, 0),
+    'w': (-1, 0),
+    'ne': (0, 1),
+    'sw': (0, -1),
+    'nw': (-1, 1),
+    'se': (1, -1),
+}
+
+MOVES = 100
+
+
+def main():
+    flipped_tiles = defaultdict(int)
+
+    for instruction in instructions:
+        coord = parse_instruction(instruction)
+        flipped_tiles[coord] += 1
+
+        print(''.join(instruction), coord)
+    blacks = set([x[0] for x in flipped_tiles.items() if x[1] % 2 == 1])
+
+    for day in range(MOVES):
+        new_blacks = set()
+        bbox = get_bbox(blacks)
+        for x in range(bbox[0] - 1, bbox[2] + 2):
+            for y in range(bbox[1] - 1, bbox[3] + 2):
+                coord = (x, y)
+                neighbors = get_neighbors(coord)
+                adj_blacks = len([x for x in neighbors if x in blacks])
+                is_black = coord in blacks
+                if is_black and adj_blacks in [1, 2]:
+                    new_blacks.add(coord)
+                elif not is_black and adj_blacks == 2:
+                    new_blacks.add(coord)
+        blacks = new_blacks
+        print(f'Day {day+1:>3}: {len(blacks)}')
+
+
+def parse_instruction(instruction):
+    coord = (0, 0)
+    for move in instruction:
+        dx, dy = MOVEMENTS[move]
+        coord = (coord[0] + dx, coord[1] + dy)
+    return coord
+
+
+def get_bbox(coords):
+    x_coords = list(map(lambda coord: coord[0], coords))
+    y_coords = list(map(lambda coord: coord[1], coords))
+    return min(x_coords), min(y_coords), max(x_coords), max(y_coords)
+
+
+def get_neighbors(coord):
+    neigh = []
+    for dx, dy in MOVEMENTS.values():
+        neigh.append((coord[0] + dx, coord[1] + dy))
+    return neigh
+
+
+main()
diff --git a/2020/24/solution1.py b/2020/24/solution1.py
new file mode 100644
index 0000000..c6a0c79
--- /dev/null
+++ b/2020/24/solution1.py
@@ -0,0 +1,53 @@
+"""Solution for 2020/24"""
+
+from collections import defaultdict
+
+instructions = []
+with open('input', 'r') as f:
+    for line in f.readlines():
+        line = line.strip()
+        i = 0
+        instruction = []
+        while i < len(line):
+            if line[i] in ['w', 'e']:
+                instruction.append(line[i])
+            else:
+                instruction.append(line[i:i+2])
+                i += 1
+            i += 1
+        instructions.append(instruction)
+
+
+print(instructions)
+
+MOVEMENTS = {
+    'e': (1, 0),
+    'w': (-1, 0),
+    'ne': (0, 1),
+    'sw': (0, -1),
+    'nw': (-1, 1),
+    'se': (1, -1),
+}
+
+
+def parse_instruction(instruction):
+    coord = (0, 0)
+    for move in instruction:
+        dx, dy = MOVEMENTS[move]
+        coord = (coord[0] + dx, coord[1] + dy)
+    return coord
+
+
+def main():
+    flipped_tiles = defaultdict(int)
+
+    for instruction in instructions:
+        coord = parse_instruction(instruction)
+        flipped_tiles[coord] += 1
+
+        print(''.join(instruction), coord)
+    blacks = [x[0] for x in flipped_tiles.items() if x[1] % 2 == 1]
+    print('flipped', blacks)
+    print(len(blacks))
+
+main()
diff --git a/2020/25/example b/2020/25/example
new file mode 100644
index 0000000..9cbfc23
--- /dev/null
+++ b/2020/25/example
@@ -0,0 +1,2 @@
+5764801
+17807724
diff --git a/2020/25/input b/2020/25/input
new file mode 100644
index 0000000..5ef34a0
--- /dev/null
+++ b/2020/25/input
@@ -0,0 +1,2 @@
+11349501
+5107328
diff --git a/2020/25/solution.py b/2020/25/solution.py
new file mode 100644
index 0000000..3f7b508
--- /dev/null
+++ b/2020/25/solution.py
@@ -0,0 +1,35 @@
+with open('input', 'r') as f:
+    p_key_a = int(f.readline())
+    p_key_b = int(f.readline())
+
+
+print(p_key_a, p_key_b)
+
+PRIME = 20201227
+SUBJECT_NUMBER = 7
+
+
+def main():
+    enc_key = 1
+
+    loop_size_a = 0
+    print('Brute forcing loop size of a...')
+    while enc_key != p_key_b:
+        enc_key = loop(enc_key, SUBJECT_NUMBER)
+        loop_size_a += 1
+
+    enc_key = 1
+    print(loop_size_a)
+    for _ in range(loop_size_a):
+        enc_key = loop(enc_key, p_key_a)
+
+    print(enc_key)
+
+    pass
+
+
+def loop(num, subj_num):
+    return (num * subj_num) % PRIME
+
+
+main()
diff --git a/lib/aoc.sh b/lib/aoc.sh
new file mode 100755
index 0000000..b4d5725
--- /dev/null
+++ b/lib/aoc.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+PARENT_DIR=$(dirname $PWD)
+YEAR=${PARENT_DIR##*/}
+DAY_RAW=${PWD##*/}
+DAY=$((10#$DAY_RAW))
+
+SESSION_KEY=$(cat ~/.aocrc)
+
+echo "Fetching ${YEAR} ${DAY}"
+echo $SESSION_KEY
+
+curl -b session=$SESSION_KEY https://adventofcode.com/${YEAR}/day/${DAY}/input > input
+
+echo "Visit: https://adventofcode.com/${YEAR}/day/${DAY}"
+