🎉 initialise le repo comme en 2020 et 2019

.gitignore

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+input.txt
+/.idea

add.sh

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+#!/usr/bin/zsh
+
+SCRIPT_PATH="$( cd "$(dirname "$0")" ; pwd -P )"
+NUMBER=$1
+
+if [ ! -d "${SCRIPT_PATH}/day_${NUMBER}" ]; then
+  mkdir "${SCRIPT_PATH}/day_${NUMBER}"
+else
+  echo "folder ${SCRIPT_PATH}/day_${NUMBER} already exists"
+  exit
+fi
+
+cd "${SCRIPT_PATH}/day_${NUMBER}" || exit
+
+touch input.txt part_1.php part_2.php
+
+echo "DONE"
+
+exit

day_1/part_1.php

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+<?php
+
+$numbers = array_map('intval', explode("\n", file_get_contents('input.txt')));
+
+$current = array_shift($numbers);
+$count = 0;
+foreach ($numbers as $number) {
+    if ($number > $current) {
+        $count++;
+    }
+
+    $current = $number;
+}
+
+echo $count;

day_1/part_2.php

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+<?php
+
+$numbers = array_map('intval', explode("\n", file_get_contents('input.txt')));
+
+$current_slice = array_sum(array_slice($numbers, 0, 3));
+
+$count = 0;
+
+for ($i = 1, $l = count($numbers) - 3; $i <= $l; $i++) {
+    $new_slice = array_sum(array_slice($numbers, $i, 3));
+    if ($new_slice > $current_slice) {
+        $count++;
+    }
+
+    $current_slice = $new_slice;
+}
+
+echo $count;