/in/foo.cc: In function 'int main()':
/in/foo.cc:64:11: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout<<ans<<endl;
           ^~~
/in/foo.cc:29:14: warning: 'next' may be used uninitialized in this function [-Wmaybe-uninitialized]
     while(now!=n)
           ~~~^~~