2022/Day 04

Author: agrison

src/main/kotlin/me/grison/aoc/Extensions.kt

@@ -350,7 +350,7 @@ fun Collection<Long>.toRange() = LongRange(this.first(), this.last())
 fun Pair<Int, Int>.toRange() = IntRange(this.first, this.second)
 fun Pair<Long, Long>.toRange() = LongRange(this.first, this.second)
 
-fun IntRange.contains(range: IntRange) = this.first <= range.first && this.last >= range.last
+operator fun IntRange.contains(range: IntRange) = this.first <= range.first && this.last >= range.last
 fun IntRange.overlap(range: IntRange) = range.first in this || this.first in range
 
 fun Collection<Int>.range() = maxOrNull()!! - minOrNull()!!

src/main/kotlin/me/grison/aoc/y2022/Day04.kt

@@ -5,7 +5,7 @@ import me.grison.aoc.*
 class Day04 : Day(4, 2022) {
  override fun title() = "Camp Cleanup"
 
- override fun partOne() = solve { a, b -> a.contains(b) || b.contains(a) }
+ override fun partOne() = solve { a, b -> a in b || b in a }
 
  override fun partTwo() = solve { a, b -> a.overlap(b) }