/in/foo.cc: In function 'int main()':
/in/foo.cc:14:13: warning: unused variable 'x3' [-Wunused-variable]
   x1=x2;int x3=x1;cin>>x2; 
             ^~
/in/foo.cc:11:14: warning: variable 'masp' set but not used [-Wunused-but-set-variable]
  int max=gcd,masp,xx1,xx2;
              ^~~~
/in/foo.cc:21:18: warning: 'xx2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<xx1<<" "<<xx2<<endl;
                  ^~~
/in/foo.cc:21:13: warning: 'xx1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<xx1<<" "<<xx2<<endl;
             ^~~