Back in 2004, Google ran a recruitment campaign where they posted the following billboard along the main freeway running through Silicon Valley, and later at other locations in the country: For those who managed to find the answer, a second problem awaited on the secret web site, and those who solved that were then encouraged to send in a job application. Effectively nerd sniped, I started playing with this problem sometime last year, and it led down a path to some excellent programming exercise...