View Compilation Error

0_0_33908812_4805.cpp: In function 'int main()':
0_0_33908812_4805.cpp:39:15: error: cannot bind 'std::ostream {aka std::basic_ostream<char>}' lvalue to 'std::basic_ostream<char>&&'
  cout << ans[n] << endl;
               ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_33908812_4805.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:602:5: note: initializing argument 1 of 'std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = node]'
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^