/in/foo.c: In function 'main':
/in/foo.c:55:12: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
   printf("%d %d\n",a[i][0],a[i][1]);
            ^
/in/foo.c:55:15: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long int' [-Wformat=]
   printf("%d %d\n",a[i][0],a[i][1]);
               ^
/in/foo.c:49:14: warning: unused variable 'j' [-Wunused-variable]
  int n1,n2,i,j,k;
              ^