Day 3: Mull It Over
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- What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
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3 points
*
Kotlin
fun part1(input: String): Int {
val pattern = "mul\\((\\d{1,3}),(\\d{1,3})\\)".toRegex()
var sum = 0
pattern.findAll(input).forEach { match ->
val first = match.groups[1]?.value?.toInt()!!
val second = match.groups[2]?.value?.toInt()!!
sum += first * second
}
return sum
}
fun part2(input: String): Int {
val pattern = "mul\\((\\d{1,3}),(\\d{1,3})\\)|don't\\(\\)|do\\(\\)".toRegex()
var sum = 0
var enabled = true
pattern.findAll(input).forEach { match ->
if (match.value == "do()") enabled = true
else if (match.value == "don't()") enabled = false
else if (enabled) {
val first = match.groups[1]?.value?.toInt()!!
val second = match.groups[2]?.value?.toInt()!!
sum += first * second
}
}
return sum
}
3 points
