day01: Solve puzzles

Makefile

@@ -3,6 +3,8 @@
 all: day01 day02 day03 day04 day05 day06 day07 day08 day09 day10 day11 day12 day13 day14 day15 day16 day17 day18 day19 day20 day21 day22 day23 day24 day25
 
 day01:
+	php day01/solve.php input
+
 day02:
 day03:
 day04:

day01/example.txt

@@ -0,0 +1,10 @@
+199
+200
+208
+210
+200
+207
+240
+269
+260
+263

day01/solve.php

@@ -0,0 +1,38 @@
+<?php
+declare(strict_types=1);
+
+require_once(__DIR__.'/../lib/functions.php');
+
+$entries = getLines(__DIR__.'/'.$argv[1].'.txt');
+
+timedPrintf(
+    '[2021-12-01.1] Amount of increases: %d [Time: %ss]',
+    (function (array $entries) : int {
+        $incs = 0;
+
+        for ($i = 0; $i < count($entries) - 1; $i++) {
+            if ($entries[$i] < $entries[$i + 1]) {
+                $incs++;
+            }
+        }
+
+        return $incs;
+    }),
+    $entries
+);
+
+timedPrintf(
+    '[2021-12-01.2] Amount of increases: %d [Time: %ss]',
+    (function (array $entries) : int {
+        $incs = 0;
+
+        for ($i = 0; $i < count($entries) - 3; $i++) {
+            if ($entries[$i] < $entries[$i + 3]) {
+                $incs++;
+            }
+        }
+
+        return $incs;
+    }),
+    $entries
+);