腾讯笔试--判断正方形

//import java.util.ArrayList.*;
import java.util.Scanner;
import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int t=sc.nextInt();
        while(t!=0){
            t--;
            int[] x=new int[4];
            int[] y=new int[4];
            for(int i=0;i<4;i++)
                x[i]=sc.nextInt();
            for(int i=0;i<4;i++)
                y[i]=sc.nextInt();


            String str="No";
            HashSet
 
   hashSet=new HashSet
  
   (); Loop: for(int i=0;i<4;i++){ for(int j=i+1;j<4;j++){ hashSet.add(l2(x[i],y[i],x[j],y[j])); if(hashSet.size()>2) break Loop; } } if(hashSet.size()==2) { Iterator
   
     iterator = hashSet.iterator(); //迭代器 Integer a = iterator.next(); Integer b = iterator.next(); if (b == 2 * a) str = "Yes"; } //System.out.println(hashSet.size()); System.out.println(str); } } public static int l2(int x1,int y1,int x2,int y2){ return (x1-x2)*(x1-x2)+(y1-y2)*(y1-y2); } }