Solve 2020/18

2020/18/input

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+3 + (9 * 2 + 6 + (4 + 8 + 9 * 5) * 4) * 8
+9 * (7 + 8)
+8 * (7 + 8 + (5 + 5 * 8) + 7 + 3) + 6
+(4 + 2 + 7 * 5) * 9 * 3 + 8 + 7 + ((9 * 4 * 4) + 4 * (6 * 3 * 3 * 6))
+(2 * 8 + (8 + 4 * 9 * 6 * 2) * 7) * 9 * 6 * 5
+9 + 7 + (4 + 5 + 6 + 3) + 3 * 6
+(8 * 2) + 4 + 3 + 7 * 2
+(4 * 4 + 4) + 8
+6 + 4 + 8
+3 * (5 + (2 * 6 * 5 + 7 * 6) + 7 * 2 * 8 * 8) + 8 * 4
+8 * 7 * (3 * 4 + 6 + 2 * 9 + 9) * 3 + (3 + 5)

2020/18/solution1.py

@@ -0,0 +1,61 @@
+import re
+
+example1 = '1 + 2 * 3 + 4 * 5 + 6'
+example2 = '1 + (2 * 3) + (4 * (5 + 6))'
+example3 = '2 * 3 + (4 * 5)'
+example4 = '5 + (8 * 3 + 9 + 3 * 4 * 3)'
+example5 = '5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))'
+example6 = '((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2'
+
+with open('input') as f:
+    expressions = f.readlines()
+
+
+def calc(op, a, b):
+    if op == '+':
+        return a + b
+    elif op == '*':
+        return a * b
+    else:
+        raise Exception(f'Operator "{op}" not known')
+
+
+def solve(line):
+    num_stack = [0]
+    op_stack = ['+']
+
+    for char in line:
+        if char in [' ', '\n']:
+            continue
+
+        if char == '(':
+            num_stack.append(0)
+            op_stack.append('+')
+        elif char == ')':
+            op = op_stack.pop()
+            a = num_stack.pop()
+            b = num_stack.pop()
+            num_stack.append(calc(op, a, b))
+        elif char in ['+', '*']:
+            op_stack.append(char)
+        elif re.match('[0-9]', char):
+            num = int(char)
+            num_stack.append(int(char))
+            op = op_stack.pop()
+            a = num_stack.pop()
+            b = num_stack.pop()
+            num_stack.append(calc(op, a, b))
+
+        # print(num_stack, op_stack)
+    return num_stack.pop()
+
+
+print(example1, '=', solve(example1))
+print(example2, '=', solve(example2))
+print(example3, '=', solve(example3))
+print(example4, '=', solve(example4))
+print(example5, '=', solve(example5))
+print(example6, '=', solve(example6))
+
+print('Solution')
+print(sum(map(solve, expressions)))

2020/18/solution2.py

@@ -0,0 +1,112 @@
+import re
+
+example1 = '1 + 2 * 3 + 4 * 5 + 6'
+example2 = '1 + (2 * 3) + (4 * (5 + 6))'
+example3 = '2 * 3 + (4 * 5)'
+example4 = '5 + (8 * 3 + 9 + 3 * 4 * 3)'
+example5 = '5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))'
+example6 = '((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2'
+
+with open('input') as f:
+    expressions = f.readlines()
+
+
+def calc(op, a, b):
+    if op == '+':
+        return a + b
+    elif op == '*':
+        return a * b
+    else:
+        raise Exception(f'Operator "{op}" not known')
+
+
+class Node:
+    leaf_value = None
+
+    def __init__(self, expression):
+        # print('Processing', expression)
+        while expression[0] == '(':
+            level = 0
+            split = None
+            closing_bracket = None
+            for idx, char in enumerate(expression):
+                if char == '(':
+                    level += 1
+                elif char == ')':
+                    level -= 1
+                    if level == 0 and closing_bracket is None:
+                        closing_bracket = idx
+
+                if level == 0 and char == '*' and split is None:
+                    split = idx
+            # print(f'Found split at {i} within {expression}')
+            if closing_bracket + 1 == len(expression):
+                # print('stipping unneeded parens')
+                expression = expression[1:-1]
+            else:
+                if split is not None:
+                    # self.split_at(expression, split)
+                    self.split_at(expression, split)
+                else:
+                    self.split_at(expression, closing_bracket + 2)
+                return
+        if '(' in expression:
+            level = 0
+            split = None
+            for idx, char in enumerate(expression):
+                if char == '(':
+                    level += 1
+                elif char == ')':
+                    level -= 1
+
+                if level == 0 and char == '*' and split is None:
+                    split = idx
+            if split is not None:
+                self.split_at(expression, split)
+            else:
+                self.split_at(expression, expression.find('+'))
+        elif '*' in expression:
+            self.split_at(expression, expression.find('*'))
+        elif '+' in expression:
+            self.split_at(expression, expression.find('+'))
+        else:
+            self.leaf_value = int(expression.strip())
+
+    def split_at(self, expression, idx):
+        left = expression[:idx].strip()
+        right = expression[idx + 1:].strip()
+        op = expression[idx]
+        # print(f'Splitting "{left}" "{op}" "{right}"')
+        self.left = Node(left)
+        self.right = Node(right)
+        self.op = op
+
+    @ property
+    def value(self):
+        if self.leaf_value is not None:
+            return self.leaf_value
+        return calc(self.op, self.left.value, self.right.value)
+
+
+def solve(line):
+    return Node(line.strip()).value
+
+
+print(example1, '=', solve(example1))
+print(example2, '=', solve(example2))
+print(example3, '=', solve(example3))
+print(example4, '=', solve(example4))
+print(example5, '=', solve(example5))
+print(example6, '=', solve(example6))
+
+# should be 16530240
+example7 = '3 + (8 * 2 * 4) * 8 * (2 + (8 * 5 + 3 * 4 + 4)) * (2 * (5 * 6))'
+print(example7, '=', solve(example7), 'should be', '16530240')
+
+
+print('Solution')
+# for expr in expressions:
+#     print(expr.strip(), '=', solve(expr))
+
+print(sum(map(solve, expressions)))
+