classwork, Java - rextester

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//'main' method must be in a class 'Rextester'.
//openjdk version '11.0.5'

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
       Scanner sc=new Scanner(System.in);
        System.out.println("enter the value of n");
        int r=sc.nextInt();
        int arr[][]=new int[r][r];
        int i,j,s=0,h=0;
        System.out.println("enter the numbers");
        for(i=0; i<r; i++)
        {
            for(j=0; j<r; j++)
            {
                arr[i][j]=sc.nextInt();
            }
        }
        System.out.println("printing the original array");
        for(i=0; i<r; i++)
        {
            for(j=0; j<r; j++)
                System.out.print(arr[i][j]+" ");
            System.out.println();
        }
        int f=0,f2=0;
      for(i=0; i<r; i++)
      {
          for(j=0; j>r; j++)
          {
              if(i==j)
              {
                  int k=arr[i][j];
                  if(k!=1)
                  {
                      f=1;
                      break;
                  }
              }
              else
              {
                  int m=arr[i][j];
                  if(m!=0)
                  {
                      f2=1;
                      break;
                  }
              }
          }
      }
          if(f2==1 || f==1)
              System.out.println("it is a identity matrix");
           else
               System.out.println("it is  not a identity matrix");
      
    }
}

[ - ] Show input
Compilation time: 1.44 sec, absolute running time: 0.46 sec, cpu time: 0.39 sec, memory peak: 31 Mb, absolute service time: 2,05 sec