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README.md
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README.md
@ -5,11 +5,11 @@ This repo contains my attempt at this year's Advent of Code (2023)
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I will try and do some problems (probably not all of them) in Scala
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I will try and do some problems (probably not all of them) in Scala
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## Progress:
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## Progress:
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#### Stars: 10 / 50
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#### Stars: 9 / 50
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| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
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| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
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|:-----------------:|:-----------------:|:---:|:---:|:-----------------:|:-----------------:|:-----------------:|
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|:-----------------:|:-----------:|:---:|:---:|:-----------------:|:-----------------:|:-----------------:|
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| | | | | 1<br>:star::star: | 2<br>:star::star: | 3<br>:star::star: |
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| | | | | 1<br>:star::star: | 2<br>:star::star: | 3<br>:star::star: |
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| 4<br>:star::star: | 5<br>:star::star: | 6 | 7 | 8 | 9 | 10 |
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| 4<br>:star::star: | 5<br>:star: | 6 | 7 | 8 | 9 | 10 |
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| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
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| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
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| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
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| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
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| 25 | | | | | | |
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| 25 | | | | | | |
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@ -1,208 +0,0 @@
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package day5
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import scala.collection.mutable
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import scala.collection.mutable.ArrayBuffer
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import scala.io.{BufferedSource, Source}
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object Puzzle2 {
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case class Range(startSrc: Long, startDst: Long, length: Long, dstTable: Int) {
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def endSrc: Long = startSrc + length
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def endDst: Long = startDst + length
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def containsSrc(src: Long): Boolean = startSrc <= src && src < endSrc
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def containsDst(dst: Long): Boolean = startDst <= dst && dst < endDst
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def forward(src: Long): Long = startDst + src - startSrc
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def backward(dst: Long): Long = startSrc + dst - startDst
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override def toString: String = s"[$startSrc;$endSrc[ -> ($dstTable) [$startDst;$endDst["
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}
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class Table(val id: Int) {
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var ranges: ArrayBuffer[Range] = new ArrayBuffer()
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def addRange(range: Range): Unit = ranges.addOne(range)
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def sortRanges(): Unit = {
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var changed: Boolean = false
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do {
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changed = false
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for (i: Int <- 0 until ranges.length-1) {
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if (ranges(i).startSrc >= ranges(i + 1).startSrc + ranges(i + 1).length) {
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changed = true
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val range: Range = ranges(i)
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ranges(i) = ranges(i + 1)
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ranges(i + 1) = range
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}
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}
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} while (changed)
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}
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def fillGaps(): Unit = {
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var r1: Range = Range(0, 0, 0, id + 1)
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var r2: Range = r1
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var i: Int = 0
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while (i < ranges.length) {
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r2 = ranges(i)
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val start: Long = r1.startSrc+r1.length
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if (start != r2.startSrc) {
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ranges.insert(i, Range(start, start, r2.startSrc - start, id+1))
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i += 1
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}
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r1 = r2
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i += 1
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}
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}
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def forward(src: Long): (Long, Int) = {
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for (range: Range <- ranges) {
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if (range.containsSrc(src)) return (range.forward(src), range.dstTable)
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}
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return (src, id+1)
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}
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def backward(dst: Long): (Long, Int) = {
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for (range: Range <- ranges) {
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if (range.containsDst(dst)) return (range.backward(dst), id)
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}
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return (dst, id)
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}
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override def toString: String = s"Table $id:\n " + ranges.mkString("\n ")
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}
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var forwardingTables: Array[Table] = Array.empty
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var seeds: Array[Long] = Array.empty
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def loadInput(path: String): Unit = {
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val source: BufferedSource = Source.fromFile(path)
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val almanac: String = source.getLines().mkString("\n")
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val tables: Array[String] = almanac.split("\n\n")
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forwardingTables = new Array(tables.length - 1)
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seeds = tables(0).substring(7).split(" ").map(s => s.toLong)
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for (i: Int <- 1 until tables.length) {
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val lines: Array[String] = tables(i).split(":\n")(1).split("\n")
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val table: Table = new Table(i-1)
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for (line: String <- lines) {
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val values: Array[Long] = line.split(" ").map(v => v.toLong)
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table.addRange(Range(values(1), values(0), values(2), i))
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}
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forwardingTables(i-1) = table
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}
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source.close()
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}
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def sortTables(): Unit = {
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for (table: Table <- forwardingTables) {
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table.sortRanges()
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table.fillGaps()
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}
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}
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def simplifyTables(): Unit = {
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for (i: Int <- forwardingTables.length - 1 until 0 by -1) {
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//simplifyTable(i)
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val newTable: Table = collapseTables(forwardingTables(i-1), forwardingTables(i))
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forwardingTables(i-1) = newTable
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}
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}
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def simplifyTable(tableI: Int): Unit = {
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val table1: Table = forwardingTables(tableI)
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val table2: Table = forwardingTables(tableI+1)
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val newTable1: Table = new Table(table1.id)
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val limits: ArrayBuffer[Long] = new ArrayBuffer()
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for (r1: Range <- table1.ranges) {
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val startFrom1 = r1.startSrc
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val endFrom1 = startFrom1 + r1.length
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val startTo1 = r1.startDst
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val endTo1 = startTo1 + r1.length
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limits.addOne(startTo1)
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limits.addOne(endTo1)
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for (r2: Range <- table2.ranges) {
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val startFrom2 = r2.startSrc
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val endFrom2 = startFrom2 + r2.length
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val startTo2 = r2.startDst
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val endTo2 = startTo2 + r2.length
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limits.addOne(startFrom2)
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limits.addOne(endFrom2)
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// If overlap
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if (!(endTo1 < startFrom2 || startTo1 > endFrom2)) {
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}
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}
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}
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forwardingTables(tableI) = newTable1
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}
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def collapseTables(table1: Table, table2: Table): Table = {
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val limitsSet: mutable.Set[Long] = new mutable.HashSet()
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limitsSet.addOne(table1.ranges(0).startSrc)
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for (range: Range <- table1.ranges) {
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limitsSet.addOne(range.endSrc)
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}
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limitsSet.addOne(table1.backward(table2.ranges(0).startSrc)._1)
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for (range: Range <- table2.ranges) {
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limitsSet.addOne(table1.backward(range.endSrc)._1)
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}
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val newTable: Table = new Table(table1.id)
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val limits: Array[Long] = limitsSet.toArray.sorted
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for (i: Int <- 0 until limits.length - 1) {
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val src1: Long = limits(i)
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val dst1: (Long, Int) = table1.forward(src1)
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if (dst1._2 != table2.id) throw new Exception("Something weird happened")
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val dst2: (Long, Int) = table2.forward(dst1._1)
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newTable.addRange(Range(src1, dst2._1, limits(i+1)-src1, dst2._2))
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}
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return newTable
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}
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def forward(value: Long, tableI: Int): Long = {
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for (range: Range <- forwardingTables(tableI).ranges) {
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if (value >= range.startSrc) {
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if (value < range.startSrc + range.length) {
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return value - range.startSrc + range.startDst
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}
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} else {
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return value
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}
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}
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return value
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}
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def solve(path: String): Long = {
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println("Solving puzzle 2")
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loadInput(path)
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println("Loaded input")
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sortTables()
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for (table: Table <- forwardingTables) {
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println(table)
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}
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println("Sorted forwarding tables")
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simplifyTables()
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println("Simplified forwarding tables")
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val table: Table = forwardingTables(0)
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println(table)
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var smallest: Long = -1
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for (i: Int <- seeds.indices by 2) {
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println(s"Mapping range of seed [${seeds(i)},${seeds(i)+seeds(i+1)}]")
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for (seed: Long <- seeds(i) until seeds(i)+seeds(i+1)) {
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val location: Long = table.forward(seed)._1
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if (smallest == -1 || location < smallest) {
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smallest = location
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}
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}
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println(s"New smallest location: $smallest")
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}
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return smallest
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}
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def main(args: Array[String]): Unit = {
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val solution: Long = solve("res/day5/input1.txt")
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println(solution)
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}
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}
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@ -1,9 +0,0 @@
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package day5
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import org.scalatest.funsuite.AnyFunSuite
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class Puzzle2Test extends AnyFunSuite {
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test("Puzzle2.solve") {
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assert(Puzzle2.solve("tests_res/day5/input1.txt") == 46)
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}
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}
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