215. Kth Largest Element in an Array

desciption：
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.

解法一：
時間複雜度O(NlogN),空間複雜度O(1)
`public static int findKthLargest(int[] nums, int k) {

    Arrays.sort(nums);
    return nums[nums.length-k];

}`