// Input a 3x3 matrix, and output all 2x2 square matrices in it. The rows and
// columns of the 2x2 matrices must be adjacent in the original matrix. For each
// such matrix, also output the sum of its elements
// 
// Author:rahule@cse.iitk.ac.in

#include<stdio.h>
main()
{
  int a[3][3],i,j,sum=0;
  printf("enter a 3x3 matrix\n");
  for(i=0;i<3;i++)	//inputs the 3x3 matrix
    for(j=0;j<3;j++)
      scanf("%d",&a[i][j]);
  
  printf("All possible 2x2 matrices that can be generated are,\n");
  for(i=0;i<2;i++)	
    for(j=0;j<2;j++)		//for each element a(i,j),do the following
    {
      sum=a[i][j]+a[i][j+1]+a[i+1][j]+a[i+1][j+1];
      printf("%d   %d\n%d   %d\nSUM:%d\n\n",a[i][j],a[i][j+1],a[i+1][j],a[i+1][j+1],     sum );		//takes 2x2 matrix starting from (i,j),ie (i,j),(i,j+1),(i+1,j),(i+1,j+1) and prints it togather with its SUM
      printf("%d   %d\n%d   %d\nSUM:%d\n\n",a[i+1][j],a[i+1][j+1],a[i][j],a[i][j+1],     sum );		//swap the rows of 2x2 matrix starting from (i,j) and prints it
      printf("%d   %d\n%d   %d\nSUM:%d\n\n",a[i][j+1],a[i][j],a[i+1][j+1],a[i+1][j],     sum );		//swap the columns of 2x2 matrix starting from (i,j) and prints it
    
    }
      
}