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find Kth largest element in array
//'main' method must be in a class 'Rextester'. //Compiler version 1.8.0_111 import java.util.*; import java.lang.*; class Rextester { public static void main(String args[]) { System.out.println("Hello, World!"); System.out.println(findKthLargest(new int[]{3,2,1,5,6,4},2)); } public static int findKthLargest(int[] nums, int k) { // init heap 'the smallest element first' PriorityQueue<Integer> heap = new PriorityQueue<Integer>(); // keep k largest elements in the heap for (int n: nums) { heap.add(n); if (heap.size() > k) heap.poll(); } // output return heap.poll(); } }
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