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@gigi84 - Solution proposed by you is definitely much faster than O(n). Initially it looks like nlogn but actually it is klogn where k is no. of different ages possible.
- $ETN$ January 01, 2015I think it can be safely assumed that ages are in the range 1 - 130 so K can be taken as 130. Now if there are a million ages (i.e. 2^20) in the sorted collection, this algorithm gives 130*log2^20 (i.e. O(nlogn) which is way better than 2^20 (i.e. O(n)).