import copy

with open("data.txt", "r", encoding="utf-8") as f:
	prg = [x.rstrip().split(" ") for x in f]

def run(prg):
	acc = 0
	used_insts = set()
	i = 0
	l = len(prg)
	while i not in used_insts and i < l:
		used_insts.add(i)
		inst, val = prg[i]

		if inst == "nop":
			pass
		elif inst == "acc":
			acc += int(val)
		elif inst == "jmp":
			i += int(val)
			continue

		i += 1

	return acc, i >= l

# Part 1
acc, _ = run(prg)
print(f"1: Accumulator is {acc}.")

# Part 2
ok = False
i = 0
while not ok:
	aprg = copy.deepcopy(prg)
	for j in range(i, len(aprg) - 1):
		if aprg[j][0] == "nop":
			aprg[j][0] = "jmp"
			break
		elif aprg[j][0] == "jmp":
			aprg[j][0] = "nop"
			break

	acc, ok = run(aprg)
	i += 1
	assert i <= len(aprg)

print(f"2: Accumulator is {acc}.")