Created
December 10, 2016 18:52
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package com.advent | |
val data: List<String> = """DDDURLURURUDLDURRURULLRRDULRRLRLRURDLRRDUDRUDLRDUUDRRUDLLLURLUURLRURURLRLUDDURUULDURDRUUDLLDDDRLDUULLUDURRLUULUULDLDDULRLDLURURUULRURDULLLURLDRDULLULRRRLRLRULLULRULUUULRLLURURDLLRURRUUUDURRDLURUURDDLRRLUURLRRULURRDDRDULLLDRDDDDURURLLULDDULLRLDRLRRDLLURLRRUDDDRDLLRUDLLLLRLLRUDDLUUDRLRRRDRLRDLRRULRUUDUUDULLRLUDLLDDLLDLUDRURLULDLRDDLDRUDLDDLDDDRLLDUURRUUDLLULLRLDLUURRLLDRDLRRRRUUUURLUUUULRRUDDUDDRLDDURLRLRLLRRUDRDLRLDRRRRRRUDDURUUUUDDUDUDU | |
RLULUULRDDRLULRDDLRDUURLRUDDDUULUUUDDRDRRRLDUURDURDRLLLRDDRLURLDRRDLRLUURULUURDRRULRULDULDLRRDDRLDRUDUDDUDDRULURLULUDRDUDDDULRRRURLRRDLRDLDLLRLUULURLDRURRRLLURRRRRLLULRRRDDLRLDDUULDLLRDDRLLUUDRURLRULULRLRUULUUUUUDRURLURLDDUDDLRDDLDRRLDLURULUUDRDLULLURDLLLRRDRURUDDURRLURRDURURDLRUDRULUULLDRLRRDRLDDUDRDLLRURURLUDUURUULDURUDULRLRDLDURRLLDRDUDRUDDRLRURUDDLRRDLLLDULRRDRDRRRLURLDLURRDULDURUUUDURLDLRURRDRULLDDLLLRUULLLLURRRLLLDRRUDDDLURLRRRDRLRDLUUUDDRULLUULDURLDUUURUDRURUDRDLRRLDRURRLRDDLLLULUDDUULDURLRUDRDDD | |
RDDRUDLRLDDDRLRRLRRLUULDRLRUUURULRRLUURLLLRLULDDLDLRLULULUUDDDRLLLUDLLRUDURUDDLLDUDLURRULLRDLDURULRLDRLDLDRDDRUDRUULLLLRULULLLDDDULUUDUUDDLDRLRRDLRLURRLLDRLDLDLULRLRDLDLRLUULLDLULRRRDDRUULDUDLUUUUDUDRLUURDURRULLDRURUDURDUULRRULUULULRLDRLRLLRRRLULURLUDULLDRLDRDRULLUUUDLDUUUDLRDULRDDDDDDDDLLRDULLUDRDDRURUDDLURRUULUURURDUDLLRRRRDUDLURLLURURLRDLDUUDRURULRDURDLDRUDLRRLDLDULRRUDRDUUDRLURUURLDLUDLLRDDRDU | |
LLDDDDLUDLLDUDURRURLLLLRLRRLDULLURULDULDLDLLDRRDLUDRULLRUUURDRLLURDDLLUDDLRLLRDDLULRLDDRURLUDRDULLRUDDLUURULUUURURLRULRLDLDDLRDLDLLRUURDLUDRRRDDRDRLLUDDRLDRLLLRULRDLLRLRRDDLDRDDDUDUDLUULDLDUDDLRLDUULRULDLDULDDRRLUUURUUUDLRDRULDRRLLURRRDUDULDUDUDULLULLULULURLLRRLDULDULDLRDDRRLRDRLDRLUDLLLUULLRLLRLDRDDRUDDRLLDDLRULLLULRDDDLLLDRDLRULDDDLULURDULRLDRLULDDLRUDDUDLDDDUDRDRULULDDLDLRRDURLLRLLDDURRLRRULLURLRUDDLUURULULURLRUDLLLUDDURRLURLLRLLRRLDULRRUDURLLDDRLDLRRLULUULRRUURRRDULRLRLRDDRDULULUUDULLLLURULURRUDRLL | |
UULLULRUULUUUUDDRULLRLDDLRLDDLULURDDLULURDRULUURDLLUDDLDRLUDLLRUURRUDRLDRDDRRLLRULDLLRUUULLLDLDDULDRLRURLDRDUURLURDRUURUULURLRLRRURLDDDLLDDLDDDULRUDLURULLDDRLDLUDURLLLLLRULRRLLUDRUURLLURRLLRDRLLLRRDDDRRRDLRDRDUDDRLLRRDRLRLDDDLURUUUUULDULDRRRRLUDRLRDRUDUDDRULDULULDRUUDUULLUDULRLRRURDLDDUDDRDULLUURLDRDLDDUURULRDLUDDLDURUDRRRDUDRRDRLRLULDRDRLRLRRUDLLLDDDRURDRLRUDRRDDLDRRLRRDLUURLRDRRUDRRDLDDDLRDDLRDUUURRRUULLDDDLLRLDRRLLDDRLRRRLUDLRURULLDULLLUDLDLRLLDDRDRUDLRRDDLUU""" | |
.split("\n") | |
fun main(args: Array<String>) { | |
println(data.map { findKey(it) }) | |
} | |
class Point(val x: Int, val y: Int) | |
val keypad = listOf(listOf(1, 2, 3), | |
listOf(4, 5, 6), | |
listOf(7, 8, 9)) | |
fun findKey(line: String): Int { | |
val result: Point = line.fold(Point(1, 1)) { acc: Point, char: Char -> | |
val diff = charToDiff(char) | |
(diff + acc).normalize() | |
} | |
return keypad[result.y][result.x] | |
} | |
fun Point.normalize(): Point { | |
return Point(x.clamp(0, 2), y.clamp(0, 2)) | |
} | |
fun Int.clamp(lo: Int, hi: Int) = Math.min(hi, (Math.max(lo, this))) | |
infix operator fun Point.plus(acc: Point): Point { | |
return Point(this.x + acc.x, this.y + acc.y) | |
} | |
fun charToDiff(char: Char): Point = | |
when (char) { | |
'U' -> Point( 0, -1) | |
'D' -> Point( 0, 1) | |
'R' -> Point( 1, 0) | |
'L' -> Point(-1, 0) | |
else -> throw IllegalStateException() | |
} |
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