2022/Day 02

Author: agrison

README.md

@@ -10,7 +10,11 @@
 🎄 --- Day 01: Calorie Counting ---
  🌟 Part 1: 71502 (4.9ms)
  🌟 Part 2: 208191 (3.42ms)
- 
+
+🎄 --- Day 02: Rock Paper Scissors ---
+ 🌟 Part 1: 9651 (4.71ms)
+ 🌟 Part 2: 10560 (2.86ms)
+ 
 ```
 
 ## Visualizations

src/main/kotlin/me/grison/aoc/y2022/Day02.kt

@@ -0,0 +1,36 @@
+package me.grison.aoc.y2022
+
+import me.grison.aoc.Day
+import me.grison.aoc.butLast
+
+class Day02 : Day(2, 2022) {
+ override fun title() = "Rock Paper Scissors"
+
+ override fun partOne() = solve()
+
+ override fun partTwo() = solve { round -> round.butLast() + roundEnding[round] }
+
+ private fun solve(inputMixer: (String) -> String = { it }): Int {
+ return inputList
+ .map { inputMixer(it) }
+ .sumOf { outcomes.getValue(it) + shapeScores.getValue(it.last()) }
+ }
+
+ // X: 🗿; Y: 📜; Z: ✂️
+ private val shapeScores = mapOf('X' to 1, 'Y' to 2, 'Z' to 3).withDefault { 0 }
+
+ private val outcomes =
+ mapOf(
+ "A X" to 3, "B Y" to 3, "C Z" to 3, // draw
+ "A Y" to 6, "B Z" to 6, "C X" to 6, // win
+ ).withDefault { 0 }
+
+ private val roundEnding = mapOf(
+ // lose
+ "A X" to 'Z' /* 🗿 -> ✂️ */, "B X" to 'X' /* 📜 -> ✂️ */, "C X" to 'Y' /* ✂️ -> 📜 */,
+ // draw
+ "A Y" to 'X' /* 🗿 -> 🗿 */, "B Y" to 'Y' /* 📜 -> 📜 */, "C Y" to 'Z' /* ✂️ -> ✂️ */,
+ // win
+ "A Z" to 'Y' /* 🗿 -> 📜 */, "B Z" to 'Z' /* 📜 -> ✂️ */, "C Z" to 'X' /* ✂️ -> 🗿 */
+ )
+}