2022/Day 05

Author: agrison

README.md

@@ -18,7 +18,14 @@
 🎄 --- Day 03: Rucksack Reorganization ---
  🌟 Part 1: 7553 (4.26ms)
  🌟 Part 2: 2758 (1.83ms)
- 
+
+🎄 --- Day 4: Camp Cleanup ---
+ 🌟 Part 1: 450 (3.52ms)
+ 🌟 Part 2: 837 (2.5ms)
+ 
+🎄 --- Day 5: Supply Stacks ---
+ 🌟 Part 1: MQTPGLLDN (7.32ms)
+ 🌟 Part 2: LVZPSTTCZ (4.71ms) 
 ```
 
 ## Visualizations

src/main/kotlin/me/grison/aoc/Collections.kt

@@ -182,3 +182,6 @@ fun <T> List<List<T>>.iterate(dimensions: Pair<Int, Int> = dimensions()): Sequen
 fun <T> List<Set<T>>.intersectAll() = this.reduce { a, b -> a.intersect(b) }
 fun <T> List<Set<T>>.unionAll() = this.reduce { a, b -> a.union(b) }
 fun List<String>.mapSet() = this.map { it.toSet() }
+
+fun <T> List<T>.rejectAll(elem: T) = this.filter { it != elem }
+fun <T> List<T>.mutable() = this.toMutableList()

src/main/kotlin/me/grison/aoc/Strings.kt

@@ -147,6 +147,8 @@ fun String.split(at: Int) = listOf(this.take(at), this.drop(at))
 
 fun String.inTwo() = this.split(this.length / 2)
 
+fun String.remove(r: Regex) = this.replace(r, "")
+
 fun foo() {
  "".replaceFirstChar { if (it.isLowerCase()) it.titlecase(Locale.getDefault()) else it.toString() }
 }

src/main/kotlin/me/grison/aoc/y2022/Day05.kt

@@ -0,0 +1,26 @@
+package me.grison.aoc.y2022
+
+import me.grison.aoc.*
+
+class Day05 : Day(5, 2022) {
+ override fun title() = "Supply Stacks"
+
+ override fun partOne() = solve { it.reversed() }
+
+ override fun partTwo() = solve { it }
+
+ fun solve(mixer: (Iterable<String>) -> Iterable<String>): String {
+ val (initial, moves) = inputGroups
+ val stacks = initial.lines().butLast()
+ .map { it.replace(" ", "[.]").remove("[^\\w.]+".regex()).list() }.transpose()
+ .map { it.rejectAll(".") }.mutable()
+
+ moves.lines().forEach {
+ val (amount, from, to) = it.allInts()
+ stacks[to - 1] = mixer(stacks[from - 1].take(amount)) + stacks[to - 1]
+ stacks[from - 1] = stacks[from - 1].drop(amount)
+ }
+
+ return stacks.map { it[0] }.join()
+ }
+}