✨ Finit le jour 8 et le début du 9

2021-12-09 17:31:46 +01:00
parent f1899b0640
commit c290b5fee6
3 changed files with 145 additions and 0 deletions
--- a/day_9/part_1.php
+++ b/day_9/part_1.php
@@ -0,0 +1,31 @@
+<?php
+
+$grid = array_map(static function ($row) {
+    return str_split($row);
+}, explode("\n", file_get_contents('./input.txt')));
+
+$low_points = [];
+
+foreach ($grid as $i => $row) {
+    foreach ($row as $j => $cell) {
+        $count = 0;
+        if (!array_key_exists($i - 1, $grid) || $grid[$i - 1][$j] > $cell) {
+            $count++;
+        }
+        if (!array_key_exists($i + 1, $grid) || $grid[$i + 1][$j] > $cell) {
+            $count++;
+        }
+        if (!array_key_exists($j - 1, $row) ||$row[$j - 1] > $cell) {
+            $count++;
+        }
+        if (!array_key_exists($j + 1, $row) || $row[$j + 1] > $cell) {
+            $count++;
+        }
+
+        if ($count === 4) {
+            $low_points[] = (int) $cell;
+        }
+    }
+}
+
+echo array_sum($low_points) + count($low_points);