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. k is always valid, 1 ≤ k ≤ array's length.


given [3,2,1,5,6,4] and k = 2, return 5.

JavaScript Code

function findKthLargest(nums, k) {
    if (k < 1 || nums == null) {
        return 0;
    return getKth(nums.length - k +1, nums, 0, nums.length - 1);
function getKth(k, nums, start, end) {
    var pivot = nums[end];
    var left = start;
    var right = end;
    while (true) {
        while (nums[left] < pivot && left < right) {
        while (nums[right] >= pivot && right > left) {
        if (left == right) {
        swap(nums, left, right);
    swap(nums, left, end);
    if (k == left + 1) {
        return pivot;
    } else if (k < left + 1) {
        return getKth(k, nums, start, left - 1);
    } else {
        return getKth(k, nums, left + 1, end);
function swap(nums, n1, n2) {
    var tmp = nums[n1];
    nums[n1] = nums[n2];
    nums[n2] = tmp;



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