hubert/Advent-of-Code
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Clean a bit

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This commit is contained in:
Hubert Van De Walle 2020-12-08 07:54:37 +01:00
parent 7d8db7b493
commit ee2dfbd40b
1 changed files with 22 additions and 15 deletions
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31
days/src/main/kotlin/Day08.kt
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@ -10,22 +10,21 @@ import org.eclipse.collections.impl.factory.primitive.IntSets
@Day(8)
class Day08(@Lines val input: Input<List<String>>) {
private val instructions = input.value
.map {
private val instructions = input.value.map {
val words = it.split(" ")
Instruction(Operation.valueOf(words[0].capitalize()), words[1].toInt())
}.toTypedArray()
fun part1() = run(instructions)
private fun run(mutatedInstructions: Array<Instruction>): Int {
private fun run(instructions: Array<Instruction>): VmResult {
var acc = 0
var ptr = 0
val visited = IntSets.mutable.empty()
while (visited.add(ptr)) {
val instruction = mutatedInstructions[ptr]
val instruction = instructions[ptr]
when (instruction.operation) {
Operation.Acc -> {
acc += instruction.argument
@ -34,28 +33,31 @@ class Day08(@Lines val input: Input<List<String>>) {
Operation.Jmp -> ptr += instruction.argument
Operation.Nop -> ptr++
}
if (ptr !in mutatedInstructions.indices) {
println(acc)
error("oob")
if (ptr !in instructions.indices) {
return VmResult.Terminated(acc)
}
}
return acc
return VmResult.Looped(acc)
}
fun part2() {
fun part2(): VmResult {
val possibleMutations = IntLists.mutable.empty()
instructions.forEachIndexed { i, e ->
if (e.operation != Operation.Acc) possibleMutations.add(i)
if (e.operation == Operation.Jmp || e.operation == Operation.Nop) possibleMutations.add(i)
}
possibleMutations.forEach { index ->
for (index in possibleMutations.toArray()) {
val copy = instructions.clone().also {
val modifiedOperation = if (it[index].operation == Operation.Nop) Operation.Jmp else Operation.Nop
it[index] = it[index].copy(operation = modifiedOperation)
}
run(copy)
val res = run(copy)
if (res is VmResult.Terminated) return res
}
error("No result found")
}
}
@ -64,6 +66,11 @@ enum class Operation { Acc, Jmp, Nop }
data class Instruction(val operation: Operation, val argument: Int)
sealed class VmResult {
data class Looped(val acc: Int) : VmResult()
data class Terminated(val acc: Int) : VmResult()
}
fun main() {
val day = createDay<Day08>()
println(day.part1())