/in/foo.cc: In function 'void Mtlt(int)':
/in/foo.cc:43:12: warning: unused variable 'j' [-Wunused-variable]
   43 |     int i, j, k = 0;
      |            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:64:12: warning: unused variable 'j' [-Wunused-variable]
   64 |     int i, j, x, y;
      |            ^
/in/foo.cc:64:15: warning: unused variable 'x' [-Wunused-variable]
   64 |     int i, j, x, y;
      |               ^
/in/foo.cc:64:18: warning: unused variable 'y' [-Wunused-variable]
   64 |     int i, j, x, y;
      |                  ^