Day13 2021

2021/src/main/kotlin/Day13.kt

@@ -0,0 +1,49 @@
+package be.vandewalleh.aoc.days
+
+import be.vandewalleh.aoc.utils.BaseDay
+import be.vandewalleh.aoc.utils.input.Day
+
+@Day
+class Day13 : BaseDay() {
+    private data class Point(val x: Int, val y: Int)
+
+    override fun part1(): Int {
+        val (nums, folds) = input()
+        val (axis, value) = folds.first()
+        return nums.toSet().fold(axis, value.toInt()).size
+    }
+
+    private fun Set<Point>.fold(axis: String, value: Int) = if (axis == "x") {
+        val (left, right) = partition { it.x < value }
+        left.toSet() + right.map { it.copy(x = 2 * value - it.x) }
+    } else {
+        val (top, bottom) = partition { it.y < value }
+        top.toSet() + bottom.map { it.copy(y = 2 * value - it.y) }
+    }
+
+    override fun part2(): String {
+        val (nums, folds) = input()
+        var all = nums.toSet()
+
+        folds.forEach { (axis, value) ->
+            all = all.fold(axis, value.toInt())
+        }
+
+        val res = StringBuilder()
+        for (y in 0..all.maxOf { it.y }) {
+            for (x in 0..all.maxOf { it.x }) {
+                if (Point(x, y) in all) res.append('#') else res.append(" ")
+            }
+            res.appendLine()
+        }
+
+        return res.toString()
+    }
+
+    private fun input(): Pair<List<Point>, List<List<String>>> {
+        val gr = input.text.split("\n\n")
+        val nums = gr[0].lines().map { it.split(",") }.map { (x, y) -> Point(x.toInt(), y.toInt()) }
+        val folds = "([xy])=(\\d+)".toRegex().findAll(gr[1]).map { it.groupValues.drop(1) }.toList()
+        return nums to folds
+    }
+}

2021/src/main/resources/day13.txt

@@ -0,0 +1,915 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6

utils/src/main/kotlin/be/vandewalleh/aoc/utils/DayRunner.kt

@@ -22,11 +22,13 @@ fun runDay(day: Int = LocalDate.now().dayOfMonth) {
     val ms1 = measureTimeMillis {
         p1 = instance.part1()
     }
-    println("part 1 ($ms1 ms): $p1")
+    println("part 1 ($ms1 ms):")
+    println(p1)
 
     val p2: Any
     val ms2 = measureTimeMillis {
         p2 = instance.part2()
     }
-    println("part 2 ($ms2 ms): $p2")
+    println("part 2 ($ms2 ms):")
+    println(p2)
 }