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# Day Eight: Handheld Halting
import os, strutils, sequtils
let input: string = paramStr(1)
var program: seq[tuple[op: string, arg: int]] =
map(split(strip(readFile(input)), '\n'),
func (instr: string): (string, int) = return (instr[0..2], parseInt(instr[4..^1])))
func execute(program: seq[tuple[op: string, arg: int]]): tuple[status: bool, acc: int] =
var executed = newSeq[bool](len(program))
var i, acc: int = 0
while i < len(program):
if executed[i]:
return (false, acc)
else:
executed[i] = true
case program[i].op
of "acc":
inc(acc, program[i].arg)
inc(i)
of "jmp":
inc(i, program[i].arg)
of "nop":
inc(i)
else:
discard
return (true, acc)
echo execute(program).acc
for i, instruction in program:
var program = program
program[i].op = if program[i].op == "nop": "jmp" else: "nop"
if execute(program).status: echo execute(program).acc
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