2020/python/day18.py

53 lines
1.4 KiB
Python
Raw Normal View History

import fileinput
def solve(line):
if line[0].isdigit():
if len(line) == 1:
return int(line[0])
if len(line) == 3 and line[1] == '+':
return int(line[0]) + int(line[2])
if len(line) == 3 and line[1] == '*':
return int(line[0]) * int(line[2])
if line[1] == '+':
if line[2] == '(':
depth = 1
for i, c in enumerate(line[3:]):
if c == '(':
depth += 1
if c == ')':
depth -= 1
if depth == 0:
break
inner = int(line[0]) + solve(line[3:i+3])
return solve([str(inner)] + line[i+4:])
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] == '(':
depth = 1
for i, c in enumerate(line[1:]):
if c == '(':
depth += 1
if c == ')':
depth -= 1
if depth == 0:
break
inner = str(solve(line[1:i+1]))
return solve([inner] + line[i+2:])
summ = 0
for line in fileinput.input():
line = line.replace(" ", "").strip()
v = solve(list(line))
print(line, v)
summ += v
print(summ)