2023/day 15 - part 1

src/main/kotlin/me/underlow/advent2023/Day15.kt

@@ -0,0 +1,47 @@
+package me.underlow.advent2023
+
+import me.underlow.advent2022.checkResult
+import me.underlow.advent2022.readInput
+
+object LensLibrary {
+
+    fun part1(list: List<String>): Int {
+        val steps = parseInput(list)
+
+        val s = steps.map { it.calc1() }
+
+        return s.sum()
+    }
+
+    fun part2(list: List<String>): Int {
+        val directions = parseInput(list)
+        return 0
+    }
+
+    private fun parseInput(list: List<String>): List<String> {
+        return list.map { it.split(',') }.flatten()
+    }
+}
+
+private fun String.calc1(): Int {
+    var res = 0
+    for (c in this.toCharArray()) {
+        res += c.code
+        res = res * 17
+        res = res % 256
+    }
+    return res
+}
+
+
+fun main() {
+    val input = readInput("$pathPrefix23/day15.txt")
+    val res1 = LensLibrary.part1(input)
+    val res2 = LensLibrary.part2(input)
+
+    println("part 1: $res1")
+    println("part 2: $res2")
+
+    checkResult(res1, 503487)
+    checkResult(res2, 0)
+}