/in/foo.cc: In function 'int main()':
/in/foo.cc:23:10: warning: unused variable 'j' [-Wunused-variable]
  int n,i,j,now,next,x,y,z,d;
          ^
/in/foo.cc:23:16: warning: unused variable 'next' [-Wunused-variable]
  int n,i,j,now,next,x,y,z,d;
                ^~~~
/in/foo.cc:23:27: warning: unused variable 'd' [-Wunused-variable]
  int n,i,j,now,next,x,y,z,d;
                           ^