longda

/*

https://www.hackerrank.com/challenges/pairs

Given N integers, count the number of pairs of integers whose difference is K.

Input Format

The first line contains N and K. 
The second line contains N numbers of the set. All the N numbers are unique.

longda

//http://ideone.com/AW2VoY
/* package whatever dijkstra w/ priority queue; // don't place package name! */

import java.util.PriorityQueue;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;

class Vertex implements Comparable<Vertex>
{