How to let quick select cope large duplicate values?

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    When I use Quick Select function elsewhere (LeetCode 324), a case reports a stack overflow error.

    The reason is at the case where size=30k+, and all the numbers are 1,2 and 3 (lot of duplicates).

    The quick select starts to be degenerated and call (begin+1, end, k-1) because almost all the items existing in range equals the target...

    Anyone have ways of remedy? How to optimize quick select to cope this situation?

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