foo.cc: In function 'int main()':
foo.cc:30:13: error: no match for 'operator>>' (operand types are 'std::ostream' {aka 'std::basic_ostream<char>'} and 'int')
   30 |         cout>>cnt>>endl;
      |         ~~~~^~~~~
      |         |     |
      |         |     int
      |         std::ostream {aka std::basic_ostream<char>}
foo.cc:30:13: note: candidate: 'operator>>(int, int)' (built-in)
   30 |         cout>>cnt>>endl;
      |         ~~~~^~~~~
foo.cc:30:13: note:   no known conversion for argument 1 from 'std::ostream' {aka 'std::basic_ostream<char>'} to 'int'
In file included from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/string:54,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/locale_classes.h:40,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/ios_base.h:41,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/ios:42,
                 from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/ostream:38,
                 from iostream:39:
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/basic_string.tcc:940:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
  940 |     operator>>(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/basic_string.tcc:940:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
In file included from /nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:1016,
                 from iostream:40:
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/istream.tcc:975:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT&)'
  975 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |     ^~~~~~~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/bits/istream.tcc:975:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:756:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char&)'
  756 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
      |     ^~~~~~~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:756:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<char, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:761:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char&)'
  761 |     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
      |     ^~~~~~~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:761:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<char, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:803:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT*)'
  803 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |     ^~~~~~~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:803:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:846:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char*)'
  846 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
      |     ^~~~~~~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:846:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<char, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:852:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char*)'
  852 |     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
      |     ^~~~~~~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:852:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<char, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:1006:5: note: candidate: 'template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&)'
 1006 |     operator>>(_Istream&& __is, _Tp&& __x)
      |     ^~~~~~~~
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:1006:5: note:   template argument deduction/substitution failed:
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream: In substitution of 'template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&) [with _Istream = std::basic_ostream<char>&; _Tp = int&]':
foo.cc:30:8:   required from here
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/istream:1006:5: error: no type named 'type' in 'struct std::enable_if<false, void>'
In file included from foo.cc:5:
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:71:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Resetiosflags)'
   71 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Resetiosflags __f)
      |     ^~~~~~~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:71:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:101:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setiosflags)'
  101 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setiosflags __f)
      |     ^~~~~~~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:101:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:132:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setbase)'
  132 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setbase __f)
      |     ^~~~~~~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:132:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:170:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setfill<_CharT>)'
  170 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setfill<_CharT> __f)
      |     ^~~~~~~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:170:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:200:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setprecision)'
  200 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setprecision __f)
      |     ^~~~~~~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:200:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:230:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setw)'
  230 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setw __f)
      |     ^~~~~~~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:230:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:264:5: note: candidate: 'template<class _CharT, class _Traits, class _MoneyT> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Get_money<_MoneyT>)'
  264 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Get_money<_MoneyT> __f)
      |     ^~~~~~~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:264:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:418:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Get_time<_CharT>)'
  418 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Get_time<_CharT> __f)
      |     ^~~~~~~~
/nix/store/r0n0bpr0s38f02hyg0akd63yxc1d2n86-gcc/include/c++/12.3.0/iomanip:418:5: note:   template argument deduction/substitution failed:
foo.cc:30:15: note:   'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   30 |         cout>>cnt>>endl;
      |               ^~~

[Hydro](https://hydro.ac)提供评测服务