leetcode Kth Largest Element in an Array

题目连接

https://leetcode.com/problems/kth-largest-element-in-an-array/  

Kth Largest Element in an Array

Description

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.

For example,
Given $[3,2,1,5,6,4]$ and $k = 2$, return $5$.

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

class Solution {
public:
	int findKthLargest(vector<int>& nums, int k) {
		while (!q.empty()) q.pop();
		for (auto &r : nums) q.push(r);
		while (k > 1) { q.pop(); k--; }
		return q.top();
	}
private:
	struct cmp {
		bool operator()(const int &A, const int &B) {
			return A < B;
		}
	};
	priority_queue<int, vector<int>, cmp> q;
};