3 files changed, 1051 insertions(+), 0 deletions(-)

A src/main/advent2022/Day04.kt
A src/main/resources/advent2022/day04_input.txt
A src/test/advent2022/Day04KtTest.kt

@@ 0,0 1,26 @@
+package advent2022
+
+fun sectionRange(s: String): IntRange {
+    val (start, end) = s.split("-").map { it.toInt() }
+    return start..end
+}
+
+fun solve4a(lines: List<String>): Int {
+    return lines.count { line ->
+        val (s1, s2) = line.split(",").map { sectionRange(it) }.map { it.toSet() }
+        s1.containsAll(s2) || s2.containsAll(s1)
+    }
+}
+
+fun solve4b(lines: List<String>): Int {
+    return lines.count { line ->
+        val (s1, s2) = line.split(",").map { sectionRange(it) }.map { it.toSet() }
+        s1.intersect(s2).isNotEmpty()
+    }
+}
+
+fun main() {
+    val input = input("day04")
+    println(solve4a(input)) // 524
+    println(solve4b(input)) // 798
+}

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@@ 0,0 1,25 @@
+package advent2022
+
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+
+internal class Day04KtTest {
+    private val exampleAssignmentPairs = listOf(
+        "2-4,6-8",
+        "2-3,4-5",
+        "5-7,7-9",
+        "2-8,3-7",
+        "6-6,4-6",
+        "2-6,4-8",
+        )
+
+    @Test
+    fun solve4a() {
+        assertEquals(2, solve4a(exampleAssignmentPairs))
+    }
+
+    @Test
+    fun solve4b() {
+        assertEquals(4, solve4b(exampleAssignmentPairs))
+    }
+}