Complete day 3
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117
day3/day3.kt
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117
day3/day3.kt
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import java.io.File
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typealias Coordinate = Pair<Int, Int>
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fun main() {
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val input = File("input")
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var numbers: MutableMap<Coordinate, Int> = mutableMapOf()
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var symbols: MutableMap<Coordinate, Char> = mutableMapOf()
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input.useLines {
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it.forEachIndexed { row, line ->
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line.forEachIndexed { col, char ->
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when (char) {
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in '0'..'9' -> {
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// In this case, we're either starting a new
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// number, or in the middle of an existing
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// number.
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// We need to mark all previous coordinates as
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// well as this one as the full multi-digit
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// number, so we need to check the previous
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// columns.
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var length = 1
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while (numbers.get(Coordinate(row, col - length)) != null) {
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length += 1
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}
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// Now we check if the column already has a
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// number; if not, we're starting a new one,
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// otherwise mark this column as well as any
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// previous ones as the new number.
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val number = numbers.get(Coordinate(row, col - length + 1))
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if (number == null) {
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numbers.put(Coordinate(row, col), char.digitToInt())
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} else {
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for (coordinate in col downTo col - length + 1) {
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numbers.put(
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Coordinate(row, coordinate),
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number * 10 + char.digitToInt()
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)
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}
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}
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}
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// Dots are ignored
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'.' -> Unit
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// Collect the coordinates of all symbols, too
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else -> symbols.put(Coordinate(row, col), char)
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}
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}
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}
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}
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val gears: List<Int> =
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symbols
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.map { symbol ->
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if (symbol.value == '*') {
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var adjacent = 0
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var last: Int? = null
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var ratio = 1
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for (coord in nextTo(symbol.key)) {
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val number = numbers.get(coord)
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if (number != last && number != null) {
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last = number
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adjacent += 1
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ratio *= number
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}
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}
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if (adjacent == 2) {
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ratio
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} else {
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null
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}
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} else {
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null
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}
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}
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.filterNotNull()
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println("Part 1: ${gears.sum()}")
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val parts =
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symbols.flatMap { symbol ->
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nextTo(symbol.key)
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.map {
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val number = numbers.remove(it)
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if (number == null) {
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number
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} else {
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var prev: Coordinate = it
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do {
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prev = Coordinate(prev.first, prev.second - 1)
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} while (numbers.remove(prev) != null)
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var next: Coordinate = it
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do {
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next = Coordinate(next.first, next.second + 1)
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} while (numbers.remove(next) != null)
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number
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}
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}
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.filterNotNull()
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}
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println("Part 2: ${parts.sum()}")
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}
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fun nextTo(coordinate: Coordinate): List<Coordinate> {
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return (coordinate.first - 1..coordinate.first + 1).flatMap { row ->
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(coordinate.second - 1..coordinate.second + 1).map { col -> Coordinate(row, col) }
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}
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}
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140
day3/input
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140
day3/input
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@ -0,0 +1,140 @@
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...........................775.651...............887....79...946...921...493.....942..942.....151....155....................................
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......240...................*.....-......................$..*...................*.......%.....+....................956.549.*290.......834...
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.485...+............437......906......%..608.805.725..72.....242....745..61......440................................*..*.........515...*....
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..........917.......&....146........790.....*......*....*..........*.....*...............207*......................796..116......../...924..
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722...323.-................./...410.............72..748.442............384.708...............849..%............................470..........
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.....*..........................*.....271..691....-...............4*...........388.................448......&........*....848&......751.....
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....370..$....639.748.......*...467....*.....*........921*909.....................*...32.....................165..452.30....................
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........984....*.....*...782........711.....50.172...............61&..........415.803.*.........524.......................203.......106*643.
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...............57..433.........390....................&../.............*122...........674.........*.........................................
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379..................../.........*........908..477...305.876..*..............297.415*......+.......94........../.....@378.......226..56*....
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...*..-......82.......167...936.17..958...=....*...............196......+......*.......-...380.992.............989.........29......*....301.
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..124..317.....*....................*..........839.......................191.882......231.........+......976.................+......469.....
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............643................*........778............541........655..............*............*........./............*.................515
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.....&............498#...&....726.774..............111....*378..................723.221.......473............752....523.638.......789...*...
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.....353................518..........-.........../....*...............*88.........................*..@280..=..-....................-..297...
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...........279...........................*816.....286.975.&319.....614......694.......799.......503.......861...569.............+...........
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..474........*.228..............308......................................................*............207........................838..408...
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...........226./....*................82.........................268/......814.........640.............../..489........719..=..........*.....
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....83............88.544....250.......=...87..............199.........115*....................................*...377.@.....643........658..
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........-...651.............*................&..............................*379.....411...686.397............202.*....../........217.......
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.....781.......*897......630................330.....117.961..........61..543.....#...*.....*.......323.............996.603.......*..........
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.......................................................*........473....*.....739.184.511..........+......43.833.................953...@.....
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....110......@471...........*464....@.347......779................/.....205.*.......................681.....@.........................694...
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.........................203......158.-....310./...449...726*982.............437.....+....259...................185......940*702............
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.....465....*.......747....................*..........*...............................238..&......./..963...755....*........................
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.....*....687..104..%.........645........959..497..732........988........733.....12...........417.176....$..........176.323....657..........
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...566........*...........938*......418......*............925....*28..............-.156........*................................*..#........
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.............933.......................*....988........../............................*........813.................868*674...375...839......
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.....................804.......464..452...................................47......324.789..........692*288..................................
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...959...........792....*10.....=......................*455.77...827.99....*.........................................166.......8...586......
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.....*...607......*..............................12.764......*.......*..905....590.236...#.677...823......972..204............*......*......
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..661....*........776....938..901.............@.*.........$...216...995...........*....382..*....#....546*.....#...........564........707...
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......755................*.......*698......315..291.......964................-.......=.....865........................521........150........
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........................323............./............973.........*35..........318.....204...........546..+667....214%..*..............973...
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........143......&725...........619....149..............*235..650.........604..........................*..............195..............*....
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................................*.................................926...................@240......+...433..302..672.........977....149..335.
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.......880.......&...............301.512.$.....876......331.897...#..............#...............464......+...........938.........*.........
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......@....942...603....&....879..........117..........*.....*.............562..905....377*862..............*56.........%........352..*165..
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.726......*..........239....*.....915..............@...661...905..............*...................466....223.................730............
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....*......97..839.......308.........*....115....512..........................497.392.....563........=...............448...........462*884..
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....122.........*...471*...........52...&..=...................=..................@.........*...............................531.............
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.........*..522...&.....274...........116......*572...........907..........................161..670@..@....................=........57*.....
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.........28.*.....606.......................925...............................908...86...............78..............712.....813*......16...
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....549.....512....................................825.....797.......224..660*........@.425*656.........=536..256.......*........599........
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...*.............963..................842..704.............+....425..*..............................102.......$....565.179..774/........576.
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...................*..........................*..............=...*....922........50...262....%............603......*........................
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.......636.......349...&...224...$............899.........983..319.............#........&...663....*575..%.......95.....383*................
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......=...............928........218................84.............964.........953..+...........212.........................857.............
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............................179.......68......................&....*.................787.............92&.72....455..969...........846..40...
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.993=..../..........110.407*...........%.............164..#....306.215...................552..............*....=...#.....69.602...#...*.....
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......322..........#...........561..............968..*....913............%..........@586...=.330...........166.............*........863.....
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............810...........157.*....557.....30.*.....774...................968.601*...........*....491..........557.....83*..................
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.......*368.*.......842...*...435.-...........65.-................................680.....913....#.......793....*.........87.262....34.-....
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....896......875.....*...........................581.957..758............$................................@..981..............#......*.844..
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..................957...150.......503................@....*......89....59......261..........653....................................372......
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...731...-129..+........*........-......................718.713....*.......197..*......30......+...476............872.......................
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....*...........671....917.......................800.&......=....197..763....*...96......#.........*......%......*..........739......290....
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.....234..............................814*251....../.755.............../...375.....................309.914..816...877..=.......$......$.....
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.........543.378.....74.%608.25...755..........237..............834..................431..................../..........585..................
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....408...&...*..............*................*.............214*.....................*.........89.475*.......................@..939..824....
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...*..........526..........713..&.....132...899..108.75..#..................521....428....97../.......603.....248.........878...&...*.......
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....383...............873......1....................*....850....862....%......#.=................533.........*.......................863....
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.............852.........*................578%....................*..492.........905.145.927........*........437.107.....@....29............
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......604.......#./531.179..&........56.........921..233.......943......................*..........174...........*.......271.*...32.........
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........*..619.............588......*............*...*..............918*837.....120.128......508...........536...............558...*638.....
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523....794...-....................451..544....648..365.778.....@.............@.....*............$..%414...*............453#.................
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..................&......124*...........*...............*...259........696...424...........*...............322..534................*519.....
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........201*.30...474........567.526..363............%.963......287+......*.........939.964.....994.............*.....-........287.......657
|
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........................709*......=.........854...527................50..591...859....%..........*....196.......188..395..157...*...........
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.281*....878................354.......*221...*............308....309...*.........$..@...72#......577.........................*...734.....481
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.....9....*.............658........235......767..12..548...=...#.......585..830....609........................603.130.....884...........*...
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........324........@...*........................*....*........628.............................................*...$...........=......658....
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..................139.206....$.....768*........986....311..........967...15...174....100-.....7$..............962....=.........561..........
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......521.....154.............318......622...................-.............%...@.................856.......60.........24..481.......520.772.
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.825..#.......*.............................180.............228.11.....173.......128......428.........405.+...68...........=..882......*....
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....*.......657...........27....798*460...................@............-..............31.*.....840...........*................@.............
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.965...931............974...*...........................798.................455*.........856......*...809...97..934.740$..570...............
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........*..511.$427....../..652..-297............296........$........552..........884..................*........%........*........128.......
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..........-..........207............................=....641.........+..........-..*....43..........329................990...........*......
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.10...................=..11....&............................./.143........875..732....&.......&............................349.....265...858
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...*......222....495%...*...618..322.......%.........116...833....*........*.........776....288....760.........-............-...............
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....291......*..........453.........*...811...398..............515........365..445....................*.....961.........433......743...$....
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.............33..................543.........@..........................=...../.....793*...........266..............668...........#.....804.
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................701....................17*.................449*741.....961......814..........................*245......*...809*.............
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.......206......*....668..728$............529..........*93........................-...833.713..............69.......292........157...224*...
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..........*585...969............810..522............866..............254.....570........*....*.....588..................+113.......-.....752
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................................/......../......257.............119...-..844...*..979..442....169.....=.259......+.............752..401.....
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...726...967........&.234.................326.....*....590*636...*............130.../.........................933.....652*439...*...........
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.....*......*12..332...-...........500#..........944..............747.......$.....................203....513.......................%864.....
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....389.&....................*...............938.......893....970.........864........538.755&.258..*........#...............717.96......+...
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.65.....180...&.............864.....169.........*................*...390............*.........*....904.........................*...354...478
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....620......472.726.931...............*.......150../.......@....960....................*928.812...........................428......*.......
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...*................*.................463..........323.....478..........964..........175.........324%........=827......66.......193..303....
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313.......................@...705.214.....174&........................-.....271........................818...............*.........+........
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........171+..830...328..158...*..%..................17....721.....568......../...........949.............*.............608.....90......570.
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....327..........*....*.......44......................*..................193-.......67.................970......966.503................#....
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669*..........386..306....+............105............443...........................*........490..130...........*....$..........$62.........
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......454...............&..954...38....*..........229....................643......388.671....@.......*...8......506....66*148.........$.....
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......*................259.........*.................*756.......596.........*........................638..+....................%....854.....
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...700......895..............................757................*.........847..............630*612..................854..606....38..........
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...............*.....93.....573......274........*...952..336...................562..................+...637............*.*..................
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945........../.814..=..........*....*...........38..=............-....&........*..................118......*.........745..855.........367...
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......676..688..................604..153...............671......513...690....891.%.....101.728..........767......28...................../...
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.........=.......700..222.443............114.....................................458...../....#...................*.........=...............
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...........660.%...&.....*.....98.232.......*............308.......650..267/..........$............................417.....806.....502......
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.......276*....500............@.............63.......621*.....520...-........913.....225.........620.597...709*632.............663*.........
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...................232...149............65.......................&........................228.....%.....-................467............800.
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..........118........+....*....@.........-.458...737.....-247.........425................/..................574......424*.........421..*....
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......158.-....*........564.599......128......*...#..........................419.............764*156.............................*......996.
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............577.563.....................*...777.......................508..............*827............................*465.....306.........
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.........................*..............848......996*......688....154...*.......%...780......51...410......357.148..856.....................
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...648.............835.713....*...609.......................&........*..885....494..........*..........661....*.............................
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...-.....477./693..*........938.....*./...........642..149......465.502......$............=.523.........#.......892................=824.....
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....................296...........44...707..........+.....*...................462......476........@...............*..........388............
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.....58...321..............127................................446...............................965....446........114.........*.............
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.........*........951...3....*.................623.263.............=.-....122..........................=....519*...........692.......%313...
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........943.......*......$....990.......795..../......*..135.....815.483....*..937*.............................634..............771........
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............460....757.....@......511/..*............564..-..............340.......109.206.......%785..148...21....................*....&...
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.47.........&...............102........265......555..................182......12*.........................*...%.................788..200....
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.../............=..................#82..........$.......207.............*863.....751.........251.....641.702.......141..640.................
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..........23..902.......174...............*.............=.....314...........................*..........*.....*667...........*...............
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.........*...............*.......*766..842.35.......243..........*......@..................57..435....501.285.............964.....*.........
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..165...100.@512.........292.......................%......79..@...726....341.511*.............*...................573..........602.74.......
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...*..................................596#...&...............769........................314.397..&31................%..855..................
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||||||
|
...6.....673....................898..........836.......827.......+.....-..............................133*766..........*..............290...
|
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|
..........*.........799........*.........629.......634........%.188.103.......594......464.799*295.............895...930.........-....$.....
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|
.....908..504.......*......603..800..936...*......*.........768..........973...*.......*...............904*16.*................358..........
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|
.....@............825..%......&.........*...963.294.74...........%........*....102...967...-343.................#..................94.698...
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|
.810...................968..............429...........*....950..313..482..397...................33.........@..297..198...114.......*...*....
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|
.....-............................554..................................-.......245.$...............991..282.........-...*....161..894..78...
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..705.....177.....*..872@.285........*.../813.........235....729..........*287..*...472.788.645........................144..................
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|
.............*..984.......*........722............496*..........*990....79......715........*............456...................812..470......
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|
............518......@.....950.........712..............981...........................238....579.533........373.466...615/......$.....*907..
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|
..716..907.......761..471..............*......../...........823..+............978*......=.....*.....#......&....*...........................
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|
....*...............*........990.331...46....871...........*.....447.723...@...............594...............801......................#757..
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|
...312...*.........211..........*.................90.860...970.........*...375...........*.....-....*779.........&..........................
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|
.......692..............602.............................*.............595.............841...166..327......-444....154.......................
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|
..............$....316..=.............+978.843........42....135/.+332.........454.........................................707.../......295..
|
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|
.........$....743..../.......-................+........................*990..................343......#.....*...............*....684........
|
||||||
|
......651.....................644....................887.812........187.................783........749...928.291...........131...........293
|
||||||
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Reference in a new issue