/in/foo.cc: In function 'int main()':
/in/foo.cc:29:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,x,y,n,ans=0,z=0;
           ^
/in/foo.cc:29:13: warning: unused variable 'x' [-Wunused-variable]
     int i,j,x,y,n,ans=0,z=0;
             ^
/in/foo.cc:29:15: warning: unused variable 'y' [-Wunused-variable]
     int i,j,x,y,n,ans=0,z=0;
               ^