How to find the kth minimum element in an array [on hold]


silvervino
25/12/2015 9:47 am
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I am looking for an efficient algorithm to find the k'th minimum element in an unsorted array of n elements, where 1 <= k <= n. The obvious thing is to sort the array first, then pick the k'th element, which will result in a running time of O(n * log(n)) But I guess it can be done in a more efficient way, since sorting the array seems to do "too much". For example, for k=1 the task is to find the minimum of the array, which can be done in O(n).

Does anyone know a better algorithm for k>=2?


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