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

src/aoc2025/Day08.kt

@@ -88,7 +88,7 @@ fun main() {
         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 distances = createDistances(nodes)
 
@@ -100,11 +100,11 @@ fun main() {
             if (union(unionFindParentArray, n1, n2)) {
                 numCircuits++
                 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:
@@ -115,7 +115,7 @@ fun main() {
     val testInputPart2Result = part2(testInput)
     println("Part 2 Test: $testInputPart2Result")
     check(testInputPart1Result == 40L)
-    check(testInputPart2Result == 25272)
+    check(testInputPart2Result == 25272L)
 
     val input = readInput("aoc2025/Day08")
     part1(input, 1000).println()