!@#!@$ interview question, wtf ..

[Jay Vaughan]

> They always overlap at the centre, so the answer is once. 

If the definition of overlap is that the state changes from not near each other, to over each other, to not each other again, then in fact they never overlap, as they are always in the middle of doing it.

Oh dear, its a lot more fun to think about it now than it was 30 minutes ago.  Thanks guys.

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Jay Vaughan