### Problem

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.

### Example

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) {
left++;
}

while (nums[right] >= pivot && right > left) {
right--;
}

if (left == right) {
break;
}

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;
}

console.log(findKthLargest([1,2,5,3,7,4],2));
```

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