aoc-2024 - Day14 - part 1

Author: Kanialdo

advent-of-code-2024/src/Day14.kt

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+import util.Point
+import util.Vector
+import kotlin.math.abs
+
+// https://adventofcode.com/2024/day/14
+
+fun main() {
+
+ data class Robot(
+ val position: Point,
+ val vector: Vector
+ )
+
+ val regex = "p=(.*),(.*) v=(.*),(.*)".toRegex()
+
+ fun List<String>.robots() = this.map {
+ val (px, py, vx, vy) = regex.find(it)!!.destructured
+ Robot(
+ position = Point(
+ x = px.toInt(),
+ y = py.toInt(),
+ ),
+ vector = Vector(
+ x = vx.toInt(),
+ y = vy.toInt(),
+ ),
+ )
+ }
+
+ fun part1(input: List<String>, width: Int, height: Int): Int {
+
+ val maxX = width
+ val maxY = height
+
+ var q1 = 0
+ var q2 = 0
+ var q3 = 0
+ var q4 = 0
+
+ input.robots()
+ .forEach { robot: Robot ->
+ var pos = robot.position
+ println(pos)
+ repeat(100) {
+ pos += robot.vector
+ pos = Point((pos.x + maxX) % maxX, (pos.y + maxY) % maxY)
+ println(pos)
+ }
+ when {
+ pos.x < (maxX / 2) && pos.y < (maxY / 2) -> q1++
+ pos.x > (maxX / 2) && pos.y < (maxY / 2) -> q2++
+ pos.x < (maxX / 2) && pos.y > (maxY / 2) -> q3++
+ pos.x > (maxX / 2) && pos.y > (maxY / 2) -> q4++
+ }
+ }
+
+ println("$q1 $q2 $q3 $q4")
+ return q1 * q2 * q3 * q4
+ }
+
+ fun part2(input: List<String>): Int {
+ return TODO()
+ }
+
+ val testInput = readInput("Day14_test")
+ val input = readInput("Day14")
+
+ test(12) { part1(testInput, 11, 7) }
+ exec { part1(input, 101, 103) }
+ test(TODO()) { part2(testInput) }
+ exec { part2(input) }
+}