https://github.com/jagregory/abrash-black-book/blob/4028269f...
However, there's an interesting story behind this story. David Stafford, who came in first, posted that he thought he had the fastest solution and bet $100 that nobody could beat it. I posted my code which was significantly faster, and David tweaked it further to eventually win the challenge. Like a true person of honor, he did pay the $100 and I cashed his check.