✨ Finit le jour 10

day_10/part_1.php

@@ -0,0 +1,33 @@
+<?php
+
+$lines = explode("\n", file_get_contents('./input.txt'));
+
+$scores = [
+    ')' => 3,
+    ']' => 57,
+    '}' => 1197,
+    '>' => 25137,
+];
+
+$corrupted = [];
+
+foreach ($lines as $line) {
+    $chunks = [];
+    foreach (str_split($line) as $chunk) {
+        switch ($chunk) {
+            case '(': $chunks[] = ')';break;
+            case '[': $chunks[] = ']';break;
+            case '{': $chunks[] = '}';break;
+            case '<': $chunks[] = '>';break;
+            default:
+                $last_chunk = array_pop($chunks);
+                if ($last_chunk !== $chunk) {
+                    $corrupted[] = $chunk;
+                }
+        }
+    }
+}
+
+echo array_sum(array_map(static function ($score) use ($scores) {
+    return $scores[$score];
+}, $corrupted));

day_10/part_2.php

@@ -0,0 +1,47 @@
+<?php
+
+$lines = explode("\n", file_get_contents('./input.txt'));
+
+$coolos = [];
+
+foreach ($lines as $line) {
+    $chunks = [];
+    $is_cool = true;
+    foreach (str_split($line) as $chunk) {
+        switch ($chunk) {
+            case '(': $chunks[] = ')';break;
+            case '[': $chunks[] = ']';break;
+            case '{': $chunks[] = '}';break;
+            case '<': $chunks[] = '>';break;
+            default:
+                $last_chunk = array_pop($chunks);
+                if ($last_chunk !== $chunk) {
+                    $is_cool = false;
+                    break 2;
+                }
+        }
+    }
+
+    if ($is_cool) {
+        $coolos[] = $chunks;
+    }
+}
+
+$scores = [];
+foreach ($coolos as $remaining_chunks) {
+    $remaining_chunks = array_reverse($remaining_chunks);
+    $scores[] = array_reduce($remaining_chunks, static function ($carry, $chunk) {
+        $additions = [
+            ')' => 1,
+            ']' => 2,
+            '}' => 3,
+            '>' => 4,
+        ];
+        $carry *= 5;
+        $carry += $additions[$chunk];
+        return $carry;
+    });
+}
+
+sort($scores);
+echo $scores[(int) floor(count($scores) / 2)];