Problem: Kth Largest Element in an Array

Question

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 ≤ k ≤ array’s length.

Solution

TODO

Code

class Solution {
    public int findKthLargest(int[] nums, int k) {
        PriorityQueue<Integer> pq = new PriorityQueue();
        for(int num : nums) {
            pq.add(num);
            if(pq.size() > k) pq.poll();
        }
        
        return pq.peek();
    }
}

Performance