✨ Finit le jour 3

2021-12-03 12:35:42 +01:00
parent 0dc0c90964
commit 75f245787b
2 changed files with 68 additions and 0 deletions
--- a/day_3/part_1.php
+++ b/day_3/part_1.php
@@ -0,0 +1,16 @@
+<?php
+
+$lines = array_map('str_split', explode("\n", file_get_contents('input.txt')));
+$lines = array_map('array_reverse', array_map(null, ...$lines)); // matrix rotation
+
+$gamma = '';
+$epsilon = '';
+
+foreach ($lines as $line) {
+    $counts = array_count_values($line);
+    $max = array_search(max($counts), $counts);
+    $gamma .= $max;
+    $epsilon .= $max === 1 ? 0 : 1;
+}
+
+echo bindec($gamma) * bindec($epsilon);