2020/python/day18.py

54 lines
1.4 KiB
Python

import fileinput
def find_matching_parenthesis(line):
depth = 1
for i, c in enumerate(line[1:]):
if c == "(":
depth += 1
if c == ")":
depth -= 1
if depth == 0:
break
return i
def solve(line):
print("".join(line))
if line[0].isdigit():
if len(line) == 1:
return int(line[0])
if len(line) == 3:
if line[1] == "+":
return int(line[0]) + int(line[2])
if line[1] == "*":
return int(line[0]) * int(line[2])
if line[1] == "+":
if line[2] == "(":
closing = find_matching_parenthesis(line[2:])
inner = int(line[0]) + solve(line[3 : closing + 4])
return solve([str(inner)] + line[closing + 5 :])
else:
v = solve(line[:3])
return solve([str(v)] + line[3:])
if line[1] == "*":
return solve(line[:1]) * solve(line[2:])
raise BaseException(f"HELP {repr(line)}")
if line[0] == "(":
closing = find_matching_parenthesis(line[1:])
inner = str(solve(line[1 : closing +2]))
return solve([inner] + line[closing +3 :])
summ = 0
for line in fileinput.input():
line = line.replace(" ", "").strip()
v = solve(list(line))
print(line, v)
summ += v
print(summ)