Update solution
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2 changed files with 113 additions and 32 deletions
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@ -1,11 +1,14 @@
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import kotlin.math.min
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import kotlin.math.max
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class Solution05(lines: List<String>) {
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private var seeds: MutableList<ULong> = mutableListOf()
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private var seeds: MutableList<Long> = mutableListOf()
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private var maps: MutableList<MapList> = mutableListOf()
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init {
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// Parse seeds
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val (_, seedsStr) = lines[0].split(": ")
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seeds.addAll(seedsStr.split(" ").map{it.toULong()})
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seeds.addAll(seedsStr.split(" ").map{it.toLong()})
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// Parse all maps
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for (line in lines.subList(2, lines.size)) {
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@ -18,15 +21,15 @@ class Solution05(lines: List<String>) {
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val (destRangeStart, srcRangeStart, rangeLength) = line.split(" ")
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maps.last().addRange(
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srcRangeStart.toULong(),
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destRangeStart.toULong(),
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rangeLength.toULong(),
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srcRangeStart.toLong(),
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destRangeStart.toLong(),
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rangeLength.toLong(),
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)
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}
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}
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// Part 1.
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fun getLowestLocationNumber(): ULong {
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fun getLowestLocationNumber(): Long {
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return seeds
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.map{
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var num = it
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@ -41,30 +44,105 @@ class Solution05(lines: List<String>) {
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}
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// Part 2.
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fun getLowestLocationNumberForRangeOfSeeds(): ULong {
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// Available location numbers.
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var currentRanges = maps
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.last()
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.mappers
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.map{RangeFromLoc(it.destRangeStart, it.rangeLength, it.destRangeStart)}
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fun getLowestLocationNumberForRangeOfSeeds(): Long {
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var ranges = mutableListOf<RangeWithFirstSeed>()
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for (map in maps.reversed()) {
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val newList: MutableList<RangeFromLoc> = mutableListOf()
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for (i in seeds.indices step 2) {
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ranges.add(
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RangeWithFirstSeed(
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LongRange(seeds[i], seeds[i] + seeds[i+1] - 1),
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seeds[i],
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)
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)
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}
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for (map in maps) {
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val newList = mutableListOf<RangeWithFirstSeed>()
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for (mapper in map.mappers) {
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// Find intersections
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currentRanges
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for (rng in ranges) {
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val maxStart = max(mapper.sourceRangeStart, rng.range.first)
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val minEndExcl = min(mapper.sourceRangeStart + mapper.rangeLength, rng.range.last + 1)
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val len = minEndExcl - maxStart
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if (len > 0L) {
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for (rng in currentRanges) {
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val destStart = mapper.destRangeStart + (maxStart - mapper.sourceRangeStart)
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newList.add(
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RangeWithFirstSeed(
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LongRange(destStart, destStart + len - 1),
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rng.firstSeedInRange
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)
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)
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}
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}
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}
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currentRanges = newList
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// понять, какие диапазоны значений остались неиспользованными,
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// тоже добавить их в список.
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val mprs = ListOfRanges(map.mappers.map{LongRange(it.sourceRangeStart, it.sourceRangeStart + it.rangeLength - 1)}.toMutableList())
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for (rng in ranges) {
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var currentRange = rng.range
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var intrs = mprs
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.findIntersectingRanges(rng.range)
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.sortedBy{it.first}
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if (intrs.isEmpty()) {
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newList.add(
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rng
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)
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continue
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}
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for (i in intrs.indices) {
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if (intrs[i].start > currentRange.start) {
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newList.add(
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RangeWithFirstSeed(
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LongRange(intrs[i].start, currentRange.start - 1),
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rng.firstSeedInRange
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)
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)
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}
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var end = intrs[i].last
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if (i < intrs.size - 1 && intrs[i].last < intrs[i+1].first - 1) {
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end = intrs[i+1].first - 1
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newList.add(
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RangeWithFirstSeed(
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LongRange(intrs[i].last + 1, intrs[i+1].first - 1),
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rng.firstSeedInRange,
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)
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)
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}
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currentRange = LongRange(end + 1, currentRange.endInclusive)
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}
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if (!currentRange.isEmpty()) {
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newList.add(
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RangeWithFirstSeed(
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currentRange,
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rng.firstSeedInRange
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)
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)
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}
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}
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ranges = newList
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.map{
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if (it.range.last >= it.range.first) it else RangeWithFirstSeed(LongRange(it.range.last, it.range.first), it.firstSeedInRange)
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}
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.toMutableList()
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}
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return 0UL
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return ranges
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.map{it.range.first}
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.min()
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}
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}
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@ -72,13 +150,13 @@ class Solution05(lines: List<String>) {
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class MapList() {
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val mappers: MutableList<Mapper> = mutableListOf()
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fun addRange(sourceRangeStart: ULong, destRangeStart: ULong, rangeLength: ULong) {
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fun addRange(sourceRangeStart: Long, destRangeStart: Long, rangeLength: Long) {
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mappers.add(
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Mapper(sourceRangeStart, destRangeStart, rangeLength),
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)
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}
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fun mapSrcNumberToDest(src: ULong): ULong {
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fun mapSrcNumberToDest(src: Long): Long {
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for (range in mappers) {
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if (range.isNumberInSrcRange(src)) {
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return range.srcValueToDest(src)
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@ -90,19 +168,22 @@ class MapList() {
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}
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// Mapper contains one line of map.
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data class Mapper(val sourceRangeStart: ULong, val destRangeStart: ULong, val rangeLength: ULong) {
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fun srcValueToDest(v: ULong): ULong {
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data class Mapper(val sourceRangeStart: Long, val destRangeStart: Long, val rangeLength: Long) {
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fun srcValueToDest(v: Long): Long {
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return destRangeStart + v - sourceRangeStart
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}
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fun isNumberInSrcRange(num: ULong): Boolean {
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fun isNumberInSrcRange(num: Long): Boolean {
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return num >= sourceRangeStart && num < sourceRangeStart + rangeLength
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}
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}
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// Range of numbers with the first number of corresponding location.
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data class RangeFromLoc(val rangeStart: ULong, val rangeLength: ULong, val locationStart: ULong) {
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fun getIntersection(newRangeStart: ULong, newRangeLength: ULong): RangeFromLoc {
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return RangeFromLoc(rangeStart, rangeLength, locationStart)
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data class RangeWithFirstSeed(val range: LongRange, val firstSeedInRange: Long) {
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}
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data class ListOfRanges(val ranges: MutableList<LongRange>) {
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fun findIntersectingRanges(other: LongRange): List<LongRange> {
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return ranges
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.filter{it.last >= other.first && it.first <= other.last}
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}
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}
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@ -6,21 +6,21 @@ class Solution05Test {
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fun testGetLowestLocation() {
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val text = ResourceReader().readFile("day-05/test.txt")
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val res = Solution05(text).getLowestLocationNumber()
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assertEquals(35UL, res)
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assertEquals(35L, res)
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}
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@Test
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fun solvePart1() {
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val text = ResourceReader().readFile("day-05/input.txt")
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val res = Solution05(text).getLowestLocationNumber()
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assertEquals(621354867UL, res)
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assertEquals(621354867L, res)
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}
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@Test
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fun testGetLowestLocationForRangeOfSeeds() {
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val text = ResourceReader().readFile("day-05/test.txt")
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val res = Solution05(text).getLowestLocationNumberForRangeOfSeeds()
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assertEquals(46UL, res)
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assertEquals(46L, res)
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}
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@Test
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