From 1529c9709b07874c38ca1b625e64972a4f96c3ea Mon Sep 17 00:00:00 2001
From: William Brawner <me@wbrawner.com>
Date: Sat, 16 Dec 2023 22:00:41 -0700
Subject: [PATCH] Add solution for day 15 part 1

---
 src/Day15.kt | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 src/Day15.kt

diff --git a/src/Day15.kt b/src/Day15.kt
new file mode 100644
index 0000000..bfc12de
--- /dev/null
+++ b/src/Day15.kt
@@ -0,0 +1,26 @@
+fun main() {
+    fun part1(input: List<String>): Int {
+        return input.first()
+            .split(',')
+            .fold(0) { acc, s ->
+                acc + s.hash()
+            }
+    }
+
+    fun part2(input: List<String>): Int {
+        return input.size  
+    }
+
+    // test if implementation meets criteria from the description, like:
+    val testInput = readInput("Day15_test")
+    check(part1(testInput) == 1320)
+
+    val input = readInput("Day15")
+    part1(input).println()
+    check(part2(testInput) == 0)
+    part2(input).println()
+}
+
+fun String.hash(): Int = toCharArray().fold(0) { sum, char ->
+    ((sum + char.code) * 17) % 256
+}
\ No newline at end of file