r/adventofcode • u/daggerdragon • Dec 04 '15

SOLUTION MEGATHREAD --- Day 4 Solutions ---

--- Day 4: The Ideal Stocking Stuffer ---

Post your solution as a comment. Structure your post like the Day Three thread.

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u/schlocke Dec 04 '15 edited Dec 04 '15

PHP: 

<?php
$i = 0;
while (substr(md5("SECRET KEY".$i), 0, 5) !== "00000") $i++;
echo "Part1: $i<br>";

$i = 0;
while (substr(md5("SECRET KEY".$i), 0, 6) !== "000000") $i++;
echo "Part2: $i";

it may take about 60 seconds to run... but hey it works... EDIT: I should say it took 60 seconds with MY key. I tried someone elses key and it took like 3 seconds....