Median of Medians - Order Statistics

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Median of Medians is an algorithm to find a good pivot point in sorting and selection algorithms.

We first discuss how to find a median in an array of size N, with expected complexity: O(N).
We then use median of medians to have worst case complexity O(N)

Median of Medians does NOT find the median in an array. It simply gives you a good pivot point, from which you can recursively search for the median.

References:
Introduction to Algorithms -CLRS
https://en.wikipedia.org/wiki/Median_...
https://en.wikipedia.org/wiki/Selecti...

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