You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
62 lines
1.5 KiB
Python
62 lines
1.5 KiB
Python
4 years ago
|
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)))
|