✨ Finit le jour 5

day_5/part_1.php

@@ -0,0 +1,40 @@
+<?php
+
+[$columns, $movements] = explode("\n\n", file_get_contents('./input.txt'));
+
+$columns = parseColumns($columns);
+
+$movements = explode("\n", $movements);
+foreach ($movements as $movement) {
+    preg_match('/^move (\d+) from (\d+) to (\d+)$/', $movement, $matches);
+    [, $number, $from, $to] = $matches;
+    for ($i = 0; $i < $number; $i++) {
+        $element = array_pop($columns[$from]);
+        if ($element === null) {
+            break;
+        }
+
+        $columns[$to][] = $element;
+    }
+}
+
+echo implode(array_map('array_pop', $columns));
+
+function parseColumns(string $columns)
+{
+    $parsed_columns = [];
+    $rows = array_map('str_split', explode("\n", $columns));
+    array_unshift($rows, null);
+    $rows = array_map(...$rows);
+    $rows = array_map('array_reverse', $rows);
+    foreach ($rows as $row) {
+        $number = array_shift($row);
+        if (!is_numeric($number) || empty($number)) {
+            continue;
+        }
+
+        $parsed_columns[$number] = array_filter($row, fn($cell) => !empty(trim($cell)));
+    }
+
+    return $parsed_columns;
+}