Add 2023 Day 04 Part 1 solution

palinkiewicz · palinkiewicz · commit 54c9ef1b7311 · 2023-12-04T18:58:11.000+01:00
diff --git a/adventofcode2023/Day04.kt b/adventofcode2023/Day04.kt
@@ -0,0 +1,23 @@
+package adventofcode2023
+
+import java.io.File
+import kotlin.math.pow
+
+object Day04 {
+    fun part1(inputs: List<String>) {
+        println(inputs.sumOf { line ->
+            val numbers = line.split(": ")[1].split(" | ")
+            val winningNumbers = numbers[0].split(" ").filter { it != "" }
+            val actualNumbers = numbers[1].split(" ").filter { it != "" }
+            val correctNumbersCount = actualNumbers.count { winningNumbers.contains(it) }
+
+            if (correctNumbersCount == 0) 0
+            else 2.0.pow(correctNumbersCount - 1).toInt()
+        })
+    }
+}
+
+fun main() {
+    val inputs = File("resources/adventofcode2023/Day04.txt").readLines()
+    Day04.part1(inputs)
+}
