Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element.
[3,2,1,5,6,4] and k = 2, return 5.
You may assume k is always valid, 1 ≤ k ≤ array's length.
Special thanks to @mithmatt for adding this problem and creating all test cases.
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