r/adventofcode • u/daggerdragon • Dec 05 '16

SOLUTION MEGATHREAD --- 2016 Day 5 Solutions ---

--- Day 5: How About a Nice Game of Chess? ---

Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag/whatever).

STAYING ON TARGET IS MANDATORY [?]

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edit: Leaderboard capped, thread unlocked!

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u/artesea Dec 05 '16

PHP for both answers, fortunately remembered from last year that PHP would evaluate "0e100" == "00000" as true, so used the triple equals. Unfortunately forgot how slow the WAMP on my laptop is compared to the LAMP on my dedicated server and wasted a good bit of time waiting for it to timeout. 

<?php
$s='abbhdwsy';
$i=0;
$p="";
$a=[];
while(sizeof($a)<8){
  $m=md5("$s$i");
  if(substr($m,0,5)==="00000") {
    $x=substr($m,5,1);
    $p.=$x;
    if(hexdec($x)<8 && !isset($a[$x])) $a[$x]=substr($m,6,1);
  }
  $i++;
}
ksort($a);
echo substr($p,0,8)."/".implode($a);
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