LeetCode215 Kth Largest Element in an Array

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.

Example 1:

Input: [3,2,1,5,6,4] and k = 2
Output: 5

Example 2:

Input: [3,2,3,1,2,4,5,5,6] and k = 4
Output: 4

Note: 
You may assume k is always valid, 1 ≤ k ≤ array's length.

思路：

我们使用快速排序将输入降序排序，之后直接输出第k个数就可以了。

class Solution {
public:
    int findKthLargest(vector<int>& nums, int k) {
        sort(nums.rbegin(), nums.rend());
        return nums[k-1];
    }
};