/in/foo.cc: In function 'int main()':
/in/foo.cc:36:12: warning: unused variable 'j' [-Wunused-variable]
   36 |     int i, j, z, now, next;
      |            ^
/in/foo.cc:36:15: warning: unused variable 'z' [-Wunused-variable]
   36 |     int i, j, z, now, next;
      |               ^
/in/foo.cc:36:18: warning: unused variable 'now' [-Wunused-variable]
   36 |     int i, j, z, now, next;
      |                  ^~~
/in/foo.cc:36:23: warning: unused variable 'next' [-Wunused-variable]
   36 |     int i, j, z, now, next;
      |                       ^~~~