/in/foo.cc: In function 'int main()':
/in/foo.cc:8:14: warning: unused variable 'x' [-Wunused-variable]
  int n,m,i,j,x,y,ans=0;
              ^
/in/foo.cc:8:16: warning: unused variable 'y' [-Wunused-variable]
  int n,m,i,j,x,y,ans=0;
                ^
/in/foo.cc:8:18: warning: unused variable 'ans' [-Wunused-variable]
  int n,m,i,j,x,y,ans=0;
                  ^~~