If you have *lots* of numbers or if you did often, it would be better to use a binary search on a sorted array rather than using a hash.

dreadpiratepeter'sO(N log N)
Best hashO(N)
Best unsorted arrayO(N)
Binary search
(must be sorted)		O(log N)

Update: Added links.

In reply to Re: Setting In-between values in a hash (interpolating) by ikegami
in thread Setting In-between values in a hash (interpolating) by ravishi

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