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Day 8: Use long for result of part 2. X coords are > 16 bit. That it didn't overflow was pure chance.

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This commit is contained in:
Chris Hodges 2025-12-08 07:07:39 +01:00
parent 52af74ecd5
commit 909fb5c7d2
1 changed files with 4 additions and 4 deletions
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8
src/aoc2025/Day08.kt
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@ -88,7 +88,7 @@ fun main() {
return circuitSizes.sortedDescending().take(3).fold(1L) { acc, l -> acc * l } return circuitSizes.sortedDescending().take(3).fold(1L) { acc, l -> acc * l }
} }
fun part2(input: List<String>): Int { fun part2(input: List<String>): Long {
val nodes = input.map { it.splitInts(",").toIntArray() }.toTypedArray() val nodes = input.map { it.splitInts(",").toIntArray() }.toTypedArray()
val distances = createDistances(nodes) val distances = createDistances(nodes)
@ -100,11 +100,11 @@ fun main() {
if (union(unionFindParentArray, n1, n2)) { if (union(unionFindParentArray, n1, n2)) {
numCircuits++ numCircuits++
if (numCircuits == n) { if (numCircuits == n) {
return nodes[n1][0] * nodes[n2][0] return nodes[n1][0].toLong() * nodes[n2][0]
} }
} }
} }
return -1 return -1L
} }
// test if implementation meets criteria from the description, like: // test if implementation meets criteria from the description, like:
@ -115,7 +115,7 @@ fun main() {
val testInputPart2Result = part2(testInput) val testInputPart2Result = part2(testInput)
println("Part 2 Test: $testInputPart2Result") println("Part 2 Test: $testInputPart2Result")
check(testInputPart1Result == 40L) check(testInputPart1Result == 40L)
check(testInputPart2Result == 25272) check(testInputPart2Result == 25272L)
val input = readInput("aoc2025/Day08") val input = readInput("aoc2025/Day08")
part1(input, 1000).println() part1(input, 1000).println()