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authortchojnacki <tomaszchojnacki2001@gmail.com>2021-12-07 13:02:22 +0100
committertchojnacki <tomaszchojnacki2001@gmail.com>2021-12-07 13:02:22 +0100
commit7b2fce9c718eae56dc8a06aa4b4c4830dbd45e38 (patch)
treef53e29ba7c44260af026c75128ee5312165822e1 /src
parent4db920b62c8d9f611d18d4c5402c1957ba9f162d (diff)
downloadgleam_aoc2020-7b2fce9c718eae56dc8a06aa4b4c4830dbd45e38.tar.gz
gleam_aoc2020-7b2fce9c718eae56dc8a06aa4b4c4830dbd45e38.zip
Complete day 7
Diffstat (limited to 'src')
-rw-r--r--src/Day07.kt25
1 files changed, 25 insertions, 0 deletions
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))
+}