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D6: Improve performance for long graphs

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kageru 2019-12-06 11:48:19 +01:00
parent 687cba82dd
commit 54709e41f5
1 changed files with 1 additions and 1 deletions
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2019/06/day06.kt
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@ -6,7 +6,7 @@ fun main() {
val childToParent = input.associateBy { it[1] }.mapValues { it.value[0] }
val santaParents = getParents(childToParent, "SAN")
val myParents = getParents(childToParent, "YOU")
val commonParent = santaParents.first { it in myParents }
val commonParent = myParents.toSet().let { s -> santaParents.first { it in s } }
println("Part 2: ${santaParents.indexOf(commonParent) + myParents.indexOf(commonParent)}")
}