Day 14 Part 1

2024/14/puzzle.php

@@ -0,0 +1,95 @@
+<?php
+
+$inputStream = fopen('input.txt', 'r+');
+
+class Robot
+{
+    public function __construct(public int $y, public int $x, public int $horizontal, public int $vertical)
+    {
+    }
+}
+
+$height = 103;
+$width = 101;
+$time = 100;
+
+$robots = [];
+while (!feof($inputStream)) {
+    $parameters = [];
+    preg_match('/p=(?<px>-?\d+?),(?<py>-?\d+?) v=(?<vx>-?\d+?),(?<vy>-?\d+?)$/', trim(fgets($inputStream)),
+        $parameters);
+    $robots[] = new Robot($parameters['py'], $parameters['px'], $parameters['vx'], $parameters['vy']);
+}
+
+$grid = array_pad([], $height, array_pad([], $width, 0));
+
+foreach ($robots as $robot) {
+    $grid[$robot->x][$robot->y]++;
+}
+
+foreach ($grid as $row) {
+    echo implode(array_map(fn (int $c) => $c === 0 ? '.':$c, $row))."\n";
+}
+echo "\n";
+
+for ($t = 1; $t <= $time; $t++) {
+    /** @var Robot $robot */
+    foreach ($robots as $robot) {
+        $robot->x += $robot->horizontal;
+        if ($robot->x >= $width) {
+            $robot->x -= $width;
+        }
+        if ($robot->x < 0) {
+            $robot->x = $width + $robot->x;
+        }
+
+        $robot->y += $robot->vertical;
+        if ($robot->y >= $height) {
+            $robot->y -= $height;
+        }
+        if ($robot->y < 0) {
+            $robot->y = $height + $robot->y;
+        }
+    }
+
+
+
+
+    $grid = array_pad([], $height, array_pad([], $width, 0));
+
+    foreach ($robots as $robot) {
+        $grid[$robot->y][$robot->x]++;
+    }
+
+    foreach ($grid as $row) {
+        echo implode(array_map(fn (int $c) => $c === 0 ? '.':$c, $row))."\n";
+    }
+
+    echo "\n";
+}
+
+$q1 = 0;
+$q2 = 0;
+$q3 = 0;
+$q4 = 0;
+
+foreach ($robots as $robot) {
+    if ($robot->x >= ceil($width/2) && $robot->y < floor($height/2)) {
+        $q2++;
+    }
+    if ($robot->x < floor($width/2) && $robot->y < floor($height/2)) {
+        $q1++;
+    }
+    if ($robot->x < floor($width/2) && $robot->y >=ceil($height/2)) {
+        $q3++;
+    }
+    if ($robot->x >= ceil($width/2) && $robot->y >=ceil($height/2)) {
+        $q4++;
+    }
+}
+echo "$q1 - $q2 - $q3 - $q4\n";
+$safe = $q1 * $q2 * $q3 * $q4;
+echo "safety: $safe\n";
+
+echo 256598166 <= $safe ? 'WRONG!':'';
+echo PHP_EOL;