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#!/usr/bin/env python3
import aoc20
import sys
from copy import deepcopy
def parse(prog):
return [((l := line.strip().split())[0], int(l[1])) for line in prog]
def run(prog):
acc = 0
loc = 0
execed = set()
while loc < len(prog):
if loc in execed:
return False, acc
execed.add(loc)
inst, offset = prog[loc]
if inst == "acc":
acc += offset
loc += 1
elif inst == "jmp":
loc += offset
else:
loc += 1
return True, acc
def pt1(_in):
return run(parse(_in))[1]
def pt2(_in):
prog = parse(_in)
for i in range(len(prog)):
orig = prog[i]
inst, offset = orig
if inst == "jmp":
prog[i] = ("nop", offset)
elif inst == "nop":
prog[i] = ("jmp", offset)
else:
continue
ret, acc = run(prog)
if ret:
return acc
prog[i] = orig
if __name__ == "__main__":
input = aoc20.read_input(sys.argv[1:], 8)
print(pt1(input))
print(pt2(input))
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