UVA - 11349 - Symmetric Matrix

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer("");
        int cases=Integer.parseInt(br.readLine());
        for(int i=0;i<cases;i++){
            String[]str=br.readLine().split("=");
            int n=Integer.parseInt(str[1].trim());
            long [][]arr=new long[n][n];
            for(int j=0;j<n;j++){
                String[] temp=br.readLine().split(" ");
              for(int z=0;z<n;z++){
                 arr[j][z]=Long.parseLong(temp[z]);
              } 
            }
            long[][] temp=rotate180(arr);
            sb.append("Test #").append((i+1)).append(": ");
            if(check(arr, temp)){
                sb.append("Symmetric.\n");
            }else{
                sb.append("Non-symmetric.\n");
            }
           }
        System.out.print(sb);
    }
   
   
   static public long[][] rotate180(long[][] arr){
        int x=arr.length,y=arr[0].length;
        long[][]temp=new long[x][y];
        for(int i=0;i<x;i++){
          for(int j=0;j<y;j++){
              temp[i][j]=arr[x-i-1][y-j-1];
            } 
        }
        return temp;
    }
  
   static boolean check(long[][]x,long[][]y){
       for(int i=0;i<x.length;i++){
           for(int j=0;j<y.length;j++){
               if(x[i][j]!=y[i][j] ||x[i][j]<0||y[i][j]<0){
                   return false;
               }
           }
       }
       return true;
   }
}