Here's the concept, neatly illustrated: http://stackoverflow.com/a/6634668/116546 http://stackoverflow.com/a/6634668/116546 (Offtopic rant) Guess, I'm not real

Here's the concept, neatly illustrated: http://stackoverflow.com/a/6634668/116546 http://stackoverflow.com/a/6634668/116546 (Offtopic rant) Guess, I'm not really suited for programming. When I read I remembered I've heard about an algorithm for such tasks, Googled the details up to freshen my memory, and things instantly became boring. :(