AOC: solve 5th task
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2 changed files with 75 additions and 90 deletions
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@ -45,103 +45,91 @@ class Solution05(lines: List<String>) {
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// Part 2.
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fun getLowestLocationNumberForRangeOfSeeds(): Long {
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var ranges = mutableListOf<RangeWithFirstSeed>()
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var ranges = mutableListOf<LongRange>()
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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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ranges.add(LongRange(seeds[i], seeds[i] + seeds[i+1] - 1))
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}
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for (map in maps) {
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val newList = mutableListOf<RangeWithFirstSeed>()
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var minCheckedValue = Long.MIN_VALUE
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val newList = mutableListOf<LongRange>()
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for (mapper in map.mappers) {
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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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for (mapper in map.mappers.sortedBy{it.sourceRangeStart}) {
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//
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val mapperEnd = mapper.sourceRangeStart + mapper.rangeLength - 1
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val diff = mapper.destRangeStart - mapper.sourceRangeStart
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val len = minEndExcl - maxStart
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if (len > 0L) {
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// find all values before this range.
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val unmatchedValues = ranges
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.filter{it.first < mapper.sourceRangeStart}
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.map{LongRange(max(minCheckedValue, it.first), min(mapper.sourceRangeStart - 1, it.last))}
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.filter{it.first <= it.last}
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newList.addAll(unmatchedValues)
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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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// map values
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val overlappingLeftValues = ranges
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.filter{it.first < mapper.sourceRangeStart && it.last >= mapper.sourceRangeStart && it.last <= mapperEnd}
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.map{
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LongRange(
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max(mapper.sourceRangeStart, it.first) + diff,
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it.last + diff,
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)
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}
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}
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}
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.filter{it.first <= it.last}
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newList.addAll(overlappingLeftValues)
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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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val overlappingMiddleValues = ranges
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.filter{it.first >= mapper.sourceRangeStart && it.last <= mapperEnd}
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.map{
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LongRange(
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it.first + diff, it.last + diff
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)
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}
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.filter{it.first <= it.last}
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newList.addAll(overlappingMiddleValues)
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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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val overlappingRightValues = ranges
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.filter{it.first >= mapper.sourceRangeStart && it.first <= mapperEnd && it.last >= mapperEnd}
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.map{
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LongRange(
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it.first + diff,
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min(it.last, mapperEnd) + diff
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)
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}
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.filter{it.first <= it.last}
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newList.addAll(overlappingRightValues)
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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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val bigRanges = ranges
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.filter{it.first < mapper.sourceRangeStart && it.last > mapperEnd}
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.map{
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LongRange(
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mapper.sourceRangeStart + diff, mapperEnd + diff
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)
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}
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.filter{it.first <= it.last}
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newList.addAll(bigRanges)
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minCheckedValue = mapperEnd + 1
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}
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newList.addAll(
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ranges
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.filter{it.last >= minCheckedValue}
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.map{
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LongRange(
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max(it.first, minCheckedValue),
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it.last,
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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 ranges
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.map{it.range.first}
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.map{it.first}
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.min()
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}
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}
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@ -177,13 +165,3 @@ data class Mapper(val sourceRangeStart: Long, val destRangeStart: Long, val rang
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return num >= sourceRangeStart && num < sourceRangeStart + rangeLength
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}
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}
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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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@ -20,13 +20,20 @@ class Solution05Test {
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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(46L, res)
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assertEquals(46, res)
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}
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@Test
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fun solvePart2() {
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val text = ResourceReader().readFile("day-05/input.txt")
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val res = Solution05(text).getLowestLocationNumberForRangeOfSeeds()
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println(res)
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println("Your answer: $res")
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}
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@Test
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fun testPart2() {
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val text = ResourceReader().readFile("day-05/input.txt")
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val res = Solution05(text).getLowestLocationNumberForRangeOfSeeds()
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assertEquals(15880236, res)
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}
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}
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