https://leetcode.com/problems/number-of-boomerangs/

 

package com.company;import java.util.*;class Solution {    public int numberOfBoomerangs(int[][] points) {        int ret = 0;        for (int i=0; i
     
       dMap = new HashMap<>();            long dist;            int count;            for (int j=0; j
      
       > iter = dMap.entrySet().iterator();            while (iter.hasNext()) {                int val = iter.next().getValue();                ret += val * (val-1);            }        }        return ret;    }}public class Main {    public static void main(String[] args) throws InterruptedException {        System.out.println("Hello!");        Solution solution = new Solution();        // Your Codec object will be instantiated and called as such:        int[][] points = {
   {0,0},{1,0},{2,0}};        int ret = solution.numberOfBoomerangs(points);        System.out.printf("ret:%d\n", ret);        System.out.println();    }}