day(22): add solution for part 1
- also start introducing idea of cubes instead of points Signed-off-by: Matej Focko <mfocko@redhat.com>
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4 changed files with 180 additions and 0 deletions
94
src/year2021/day22/Day22.kt
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94
src/year2021/day22/Day22.kt
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package year2021.day22
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import readInput
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// region global extensions
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fun IntRange.intersect(other: IntRange): IntRange = maxOf(first, other.first)..minOf(last, other.last)
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// endregion global extensions
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// region State
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enum class State {
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On, Off
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}
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fun String.toState(): State = when (this) {
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"on" -> State.On
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"off" -> State.Off
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else -> error("Invalid state given")
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}
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// endregion State
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// region Point
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data class Point(val x: Int, val y: Int, val z: Int) {
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fun within(xRange: IntRange, yRange: IntRange, zRange: IntRange): Boolean =
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x in xRange && y in yRange && z in zRange
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}
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// endregion Point
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// region Cube
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data class Cube(val xRange: IntRange, val yRange: IntRange, val zRange: IntRange) {
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val allPoints: Iterable<Point>
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get() = xRange.flatMap { x -> yRange.flatMap { y -> zRange.map { z -> Point(x, y, z) } } }
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fun intersect(other: Cube): Cube = Cube(
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xRange = xRange.intersect(other.xRange),
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yRange = yRange.intersect(other.yRange),
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zRange = zRange.intersect(other.zRange),
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)
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}
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// endregion Cube
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// region Step
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data class Step(val state: State, val cube: Cube) {
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val allPoints: Iterable<Point>
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get() = cube.allPoints
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fun crop(cube: Cube): Step = this.copy(cube = this.cube.intersect(cube))
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}
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fun String.toStep(): Step {
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val (state, regions) = this.split(" ")
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val (xRange, yRange, zRange) =
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regions.split(",")
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.map { it.split("=")[1].split("..").map(String::toInt) }
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.map { it[0]..it[1] }
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return Step(state.toState(), Cube(xRange, yRange, zRange))
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}
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// endregion Step
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fun part1(input: List<Step>): Int = input.fold(mutableSetOf<Point>()) { turnedOn, step ->
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val croppedStep = step.crop(Cube(-50..50, -50..50, -50..50))
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when (step.state) {
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State.On -> turnedOn.addAll(croppedStep.allPoints)
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State.Off -> turnedOn.removeAll(croppedStep.allPoints)
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}
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turnedOn
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}.size
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fun part2(input: List<Step>): Long = input.fold(mutableSetOf<Triple<Int, Int, Int>>()) { turnedOn, step ->
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when (step.state) {
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State.On -> turnedOn.addAll(step.allPoints.map { Triple(it.x, it.y, it.z) })
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State.Off -> turnedOn.removeAll(step.allPoints.map { Triple(it.x, it.y, it.z) })
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}
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turnedOn
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}.size.toLong()
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fun main() {
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val smallerSample = readInput(22, "smaller_sample").map(String::toStep)
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val sample = readInput(22, "sample").map(String::toStep)
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val input = readInput(22, "input").map(String::toStep)
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check(part1(smallerSample) == 39)
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check(part1(sample) == 590784)
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println(part1(input))
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val rebootSample = readInput(22, "reboot_sample").map(String::toStep)
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check(part2(rebootSample) == 2758514936282235L)
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println(part2(input))
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}
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60
src/year2021/day22/reboot_sample.txt
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60
src/year2021/day22/reboot_sample.txt
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@ -0,0 +1,60 @@
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on x=-5..47,y=-31..22,z=-19..33
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on x=-44..5,y=-27..21,z=-14..35
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on x=-49..-1,y=-11..42,z=-10..38
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on x=-20..34,y=-40..6,z=-44..1
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off x=26..39,y=40..50,z=-2..11
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on x=-41..5,y=-41..6,z=-36..8
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off x=-43..-33,y=-45..-28,z=7..25
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on x=-33..15,y=-32..19,z=-34..11
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off x=35..47,y=-46..-34,z=-11..5
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on x=-14..36,y=-6..44,z=-16..29
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on x=-57795..-6158,y=29564..72030,z=20435..90618
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on x=36731..105352,y=-21140..28532,z=16094..90401
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on x=30999..107136,y=-53464..15513,z=8553..71215
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on x=13528..83982,y=-99403..-27377,z=-24141..23996
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on x=-72682..-12347,y=18159..111354,z=7391..80950
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on x=-1060..80757,y=-65301..-20884,z=-103788..-16709
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on x=-83015..-9461,y=-72160..-8347,z=-81239..-26856
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on x=-52752..22273,y=-49450..9096,z=54442..119054
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on x=-29982..40483,y=-108474..-28371,z=-24328..38471
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on x=-4958..62750,y=40422..118853,z=-7672..65583
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on x=55694..108686,y=-43367..46958,z=-26781..48729
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on x=-98497..-18186,y=-63569..3412,z=1232..88485
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on x=-726..56291,y=-62629..13224,z=18033..85226
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on x=-110886..-34664,y=-81338..-8658,z=8914..63723
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on x=-55829..24974,y=-16897..54165,z=-121762..-28058
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on x=-65152..-11147,y=22489..91432,z=-58782..1780
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on x=-120100..-32970,y=-46592..27473,z=-11695..61039
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on x=-18631..37533,y=-124565..-50804,z=-35667..28308
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on x=-57817..18248,y=49321..117703,z=5745..55881
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on x=14781..98692,y=-1341..70827,z=15753..70151
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on x=-34419..55919,y=-19626..40991,z=39015..114138
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on x=-60785..11593,y=-56135..2999,z=-95368..-26915
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on x=-32178..58085,y=17647..101866,z=-91405..-8878
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on x=-53655..12091,y=50097..105568,z=-75335..-4862
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on x=-111166..-40997,y=-71714..2688,z=5609..50954
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on x=-16602..70118,y=-98693..-44401,z=5197..76897
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on x=16383..101554,y=4615..83635,z=-44907..18747
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off x=-95822..-15171,y=-19987..48940,z=10804..104439
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on x=-89813..-14614,y=16069..88491,z=-3297..45228
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on x=41075..99376,y=-20427..49978,z=-52012..13762
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on x=-21330..50085,y=-17944..62733,z=-112280..-30197
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on x=-16478..35915,y=36008..118594,z=-7885..47086
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off x=-98156..-27851,y=-49952..43171,z=-99005..-8456
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off x=2032..69770,y=-71013..4824,z=7471..94418
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on x=43670..120875,y=-42068..12382,z=-24787..38892
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off x=37514..111226,y=-45862..25743,z=-16714..54663
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off x=25699..97951,y=-30668..59918,z=-15349..69697
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off x=-44271..17935,y=-9516..60759,z=49131..112598
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on x=-61695..-5813,y=40978..94975,z=8655..80240
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off x=-101086..-9439,y=-7088..67543,z=33935..83858
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off x=18020..114017,y=-48931..32606,z=21474..89843
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off x=-77139..10506,y=-89994..-18797,z=-80..59318
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off x=8476..79288,y=-75520..11602,z=-96624..-24783
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on x=-47488..-1262,y=24338..100707,z=16292..72967
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off x=-84341..13987,y=2429..92914,z=-90671..-1318
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off x=-37810..49457,y=-71013..-7894,z=-105357..-13188
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off x=-27365..46395,y=31009..98017,z=15428..76570
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off x=-70369..-16548,y=22648..78696,z=-1892..86821
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on x=-53470..21291,y=-120233..-33476,z=-44150..38147
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off x=-93533..-4276,y=-16170..68771,z=-104985..-24507
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22
src/year2021/day22/sample.txt
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22
src/year2021/day22/sample.txt
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@ -0,0 +1,22 @@
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on x=-20..26,y=-36..17,z=-47..7
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on x=-20..33,y=-21..23,z=-26..28
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on x=-22..28,y=-29..23,z=-38..16
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on x=-46..7,y=-6..46,z=-50..-1
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on x=-49..1,y=-3..46,z=-24..28
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on x=2..47,y=-22..22,z=-23..27
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on x=-27..23,y=-28..26,z=-21..29
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on x=-39..5,y=-6..47,z=-3..44
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on x=-30..21,y=-8..43,z=-13..34
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on x=-22..26,y=-27..20,z=-29..19
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off x=-48..-32,y=26..41,z=-47..-37
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on x=-12..35,y=6..50,z=-50..-2
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off x=-48..-32,y=-32..-16,z=-15..-5
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on x=-18..26,y=-33..15,z=-7..46
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off x=-40..-22,y=-38..-28,z=23..41
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on x=-16..35,y=-41..10,z=-47..6
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off x=-32..-23,y=11..30,z=-14..3
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on x=-49..-5,y=-3..45,z=-29..18
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off x=18..30,y=-20..-8,z=-3..13
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on x=-41..9,y=-7..43,z=-33..15
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on x=-54112..-39298,y=-85059..-49293,z=-27449..7877
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on x=967..23432,y=45373..81175,z=27513..53682
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4
src/year2021/day22/smaller_sample.txt
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4
src/year2021/day22/smaller_sample.txt
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@ -0,0 +1,4 @@
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on x=10..12,y=10..12,z=10..12
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on x=11..13,y=11..13,z=11..13
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off x=9..11,y=9..11,z=9..11
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on x=10..10,y=10..10,z=10..10
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