/in/foo.cc: In function 'int main()':
/in/foo.cc:60:16: warning: unused variable 'x' [-Wunused-variable]
  long long i,j,x,y;
                ^
/in/foo.cc:60:18: warning: unused variable 'y' [-Wunused-variable]
  long long i,j,x,y;
                  ^