From 7c9d8ae1bd3bbe5a0fd91f77b9064bf6ab431ae3 Mon Sep 17 00:00:00 2001
From: Clement Desmidt <cdesmidt.ext@equad.fr>
Date: Mon, 2 Dec 2024 09:47:25 +0100
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Finit=20le=20jour=201?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day_1/part_1.php | 20 ++++++++++++++++++++
 day_1/part_2.php | 21 +++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 day_1/part_1.php
 create mode 100644 day_1/part_2.php

diff --git a/day_1/part_1.php b/day_1/part_1.php
new file mode 100644
index 0000000..98886b1
--- /dev/null
+++ b/day_1/part_1.php
@@ -0,0 +1,20 @@
+<?php
+
+$list_1 = [];
+$list_2 = [];
+
+$lines = array_filter(explode("\n", file_get_contents(__DIR__.'/input.txt')), static fn($line) =>!empty($line));
+
+foreach ($lines as $line) {
+    [$a, $b] = explode("   ", $line);
+    $list_1[] = $a;
+    $list_2[] = $b;
+}
+
+sort($list_1); sort($list_2);
+$total = 0;
+for ($i=0, $l=count($list_1); $i < $l; $i++) {
+    $total += abs($list_1[$i] - $list_2[$i]);
+}
+
+echo $total;
\ No newline at end of file
diff --git a/day_1/part_2.php b/day_1/part_2.php
new file mode 100644
index 0000000..ae7c6b4
--- /dev/null
+++ b/day_1/part_2.php
@@ -0,0 +1,21 @@
+<?php
+
+$list_1 = [];
+$list_2 = [];
+
+$lines = array_filter(explode("\n", file_get_contents(__DIR__.'/input.txt')), static fn($line) =>!empty($line));
+
+foreach ($lines as $line) {
+    [$a, $b] = explode("   ", $line);
+    $list_1[] = $a;
+    $list_2[] = $b;
+}
+
+$similarity_score = 0;
+
+$count_list_2 = array_count_values($list_2);
+foreach ($list_1 as $item) {
+    $similarity_score += array_key_exists($item, $count_list_2) ? $count_list_2[$item] * $item : 0;
+}
+
+echo $similarity_score;
\ No newline at end of file