/in/foo.cc: In function 'int main()':
/in/foo.cc:5:14: warning: unused variable 'x' [-Wunused-variable]
    5 |     int n,ai,x,y;
      |              ^
/in/foo.cc:5:16: warning: unused variable 'y' [-Wunused-variable]
    5 |     int n,ai,x,y;
      |                ^