17th day both parts

2021-12-17 23:30:25 +01:00
parent 223863aa1f
commit 06ca3641aa
4 changed files with 75 additions and 0 deletions
--- a/17/part2.php
+++ b/17/part2.php
@@ -0,0 +1,38 @@
+<?php
+$input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+
+preg_match('#target area: x=(?P<x1>[\d-]*)..(?P<x2>[\d-]*), y=(?P<y2>[\d-]*)..(?P<y1>[\d-]*)#', $input[0], $found);
+$totalMaxY = 0;
+$velocities = 0;
+
+for ($x = 0; $x < 1500; $x++) {
+    for ($y = -500; $y < 500; $y++) {
+        $velocityX = $x;
+        $velocityY = $y;
+        $position = [0, 0];
+        $maxY = 0;
+        while ($position[0] < $found['x2'] && $position[1] > $found['y2']) {
+            $position[0] += $velocityX;
+            $position[1] += $velocityY;
+            if ($velocityX != 0) {
+                $velocityX += $velocityX > 0 ? -1 : 1;
+            }
+            if ($position[1] > $maxY) {
+                $maxY = $position[1];
+            }
+            $velocityY--;
+            if ($position[0] >= $found['x1'] &&
+                $position[0] <= $found['x2'] &&
+                $position[1] <= $found['y1'] &&
+                $position[1] >= $found['y2']) {
+                $velocities++;
+                if ($maxY > $totalMaxY) {
+                    $totalMaxY = $maxY;
+                }
+                break;
+            }
+        }
+    }
+}
+
+echo $velocities; //4556