Solve 2020/12

2020/12/example

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+F10
+N3
+F7
+R90
+F11

2020/12/input

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+F36

2020/12/solution1.py

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+import logging
+lines = [x.strip() for x in open('input', 'r').readlines()]
+
+east = 0
+north = 0
+# 0 = E, 1 = N, 2 = W, 3 = S
+facing = 0
+
+
+def serialize():
+    return f'N{north} E{east} F{facing}'
+
+
+for line in lines:
+    pos = serialize()
+    command = line[0]
+    number = int(line[1:])
+
+    if command in ['S', 'W', 'R']:
+        number *= -1
+    elif command in ['F'] and facing in [2, 3]:
+        number *= -1
+
+    if command in ['N', 'S']:
+        north += number
+    elif command in ['E', 'W']:
+        east += number
+    elif command in ['R', 'L']:
+        facing = (facing + number // 90) % 4
+    elif command in ['F']:
+        if facing % 2 == 0:
+            east += number
+        else:
+            north += number
+    else:
+        raise Exception(f'Unknown command: {command}')
+
+    print(f'{line}: \t{pos} -> {serialize()}')
+
+print()
+print(f'{north=} {east=} {facing=}')
+manhattan = abs(north) + abs(east)
+print('Solution')
+print(manhattan)

2020/12/solution2.py

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+lines = [x.strip() for x in open('input', 'r').readlines()]
+
+east = 0
+north = 0
+# 0 = E, 1 = N, 2 = W, 3 = S
+
+wp_east = 10
+wp_north = 1
+
+
+def serialize():
+    """Debug a position"""
+    return f'N{north} E{east} / N{wp_north} E{wp_east}'
+
+
+def rot90(x, y):
+    """Rotates counter clockwise"""
+    return [-y, x]
+
+
+for line in lines:
+    pos = serialize()
+    command = line[0]
+    number = int(line[1:])
+
+    if command in ['S', 'W', 'R']:
+        number *= -1
+
+    if command in ['N', 'S']:
+        wp_north += number
+    elif command in ['E', 'W']:
+        wp_east += number
+    elif command in ['R', 'L']:
+        number = number // 90 % 4
+        for _ in range(number):
+            wp_east, wp_north = rot90(wp_east, wp_north)
+    elif command in ['F']:
+        north += wp_north * number
+        east += wp_east * number
+    else:
+        raise Exception(f'Unknown command: {command}')
+
+    print(f'{line}: \t{pos} -> {serialize()}')
+
+print()
+manhattan = abs(north) + abs(east)
+print('Solution')
+print(manhattan)