/*Input a 3x3 matrix, and output all 2x2 square matrices in it. The rows and
columns of the 2x2 matrices may not be adjacent in the original matrix.
However, the elemnts in a row (or column) of the 2x2 matrix must appear in the
same row (or column) of 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],i1,i2,j1,j2;
  printf("enter a 3x3 matrix\n");
  for(i1=0;i1<3;i1++)	//inputs the 3x3 matrix
    for(j1=0;j1<3;j1++)
      scanf("%d",&a[i1][j1]);
  
  printf("All possible 2x2 matrices that can be generated are,\n");
  for(i1=0;i1<3;i1++)	//takes 2x2 matrix starting from (0,0),(0,1),(1,0) and (1,1) and prints it togather with its SUM
    for(i2=0;i2<3;i2++)
    {
      if(i1==i2)
	continue;
      for(j1=0;j1<3;j1++)	//takes 2x2 matrix starting from (0,0),(0,1),(1,0) and (1,1) and prints it togather with its SUM
        for(j2=0;j2<3;j2++)
	{
	  if(j1==j2)
	    continue;
	  printf("%d   %d\n%d  %d\nSUM %d:\n\n",a[i1][j1],a[i1][j2],a[i2][j1],a[i2][j2],   a[i1][j1]+a[i1][j2]+a[i2][j1]+a[i2][j2]);

	}
    }
   
}