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18.py
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18.py
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import os
inputFile = open(os.path.dirname(__file__) + '/input.txt', 'r')
lines = [line.rstrip('\n') for line in inputFile]
inputFile.close()
def resolve_bracket(stack, add_first=False):
i = len(stack) - 1
while stack[i] != '(':
i -= 1
stack.pop(i)
if add_first:
compute(stack, ['+'], i)
compute(stack, ['+', '*'], i)
def compute(stack, operators, i):
while i < len(stack):
if stack[i] in operators:
if stack[i] == '+':
stack[i - 1:i + 2] = [stack[i - 1] + stack[i + 1]]
elif stack[i] == '*':
stack[i - 1:i + 2] = [stack[i - 1] * stack[i + 1]]
i -= 1
i += 1
def part_one():
res = 0
for equation in lines:
stack = []
for char in equation:
if char != ' ':
if char == ')':
resolve_bracket(stack)
else:
stack.append(int(char) if char.isdigit() else char)
compute(stack, ['+', '*'], 0)
res += stack[0]
return res
def part_two():
res = 0
for equation in lines:
stack = []
for char in equation:
if char != ' ':
if char == ')':
resolve_bracket(stack, True)
else:
stack.append(int(char) if char.isdigit() else char)
compute(stack, ['+'], 0)
compute(stack, ['*'], 0)
res += stack[0]
return res
print(f'Part one: {part_one()}')
print(f'Part two: {part_two()}')