I believe what he means by "dynamic" is the computer science concept of dynamic programming: http://en.wikipedia.org/wiki/Dynamic_programming

When I read your question that was the first thing to pop in my head and somebody else here has pointed it out by breaking the problem down into processing 2 arrays at a time (skipping couples already processed).

Feel free to disregard this if you already know computer science

In reply to Re^5: How to code this? by admiral_grinder
in thread How to code this? by BrowserUk

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