From 7b2fce9c718eae56dc8a06aa4b4c4830dbd45e38 Mon Sep 17 00:00:00 2001
From: tchojnacki <tomaszchojnacki2001@gmail.com>
Date: Tue, 7 Dec 2021 13:02:22 +0100
Subject: Complete day 7

---
 src/Day07.kt | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 src/Day07.kt

(limited to 'src')

diff --git a/src/Day07.kt b/src/Day07.kt
new file mode 100644
index 0000000..204dca4
--- /dev/null
+++ b/src/Day07.kt
@@ -0,0 +1,25 @@
+import kotlin.math.absoluteValue
+
+fun main() {
+    fun part1(input: String): Int {
+        val numbers = input.trim().split(",").map(String::toInt)
+        val range = numbers.minOrNull()!!..numbers.maxOrNull()!!
+
+        return range.minOf { n -> numbers.sumOf { (it - n).absoluteValue } }
+    }
+
+    fun part2(input: String): Int {
+        val numbers = input.trim().split(",").map(String::toInt)
+        val range = numbers.minOrNull()!!..numbers.maxOrNull()!!
+
+        return range.minOf { n -> numbers.map { (it - n).absoluteValue }.sumOf { (it * (it + 1)) / 2 } }
+    }
+
+    val testInput = readInputAsString("Day07_test")
+    check(part1(testInput) == 37)
+    check(part2(testInput) == 168)
+
+    val input = readInputAsString("Day07")
+    println(part1(input))
+    println(part2(input))
+}
-- 
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