Day01 2021

2021/src/main/kotlin/Day01.kt

@@ -0,0 +1,28 @@
+package be.vandewalleh.aoc.days
+
+import be.vandewalleh.aoc.utils.input.Day
+import be.vandewalleh.aoc.utils.input.Input
+import be.vandewalleh.aoc.utils.input.Lines
+
+@Day(1)
+class Day01(@Lines input: Input<IntArray>) {
+    private val items = input.value
+
+    fun part1(): Int {
+        var count = 0
+        for (i in 0 until items.size - 1) {
+            if (items[i] < items[i + 1]) count++
+        }
+        return count
+    }
+
+    fun part2(): Int {
+        var count = 0
+        for (i in 0 until items.size - 3) {
+            val a = items.drop(i).take(3).sum()
+            val b = items.drop(i + 1).take(3).sum()
+            if (b > a) count++
+        }
+        return count
+    }
+}