foo.cc: In function ‘int main()’:
foo.cc:8:33: error: no match for ‘operator>>’ (operand types are ‘std::basic_istream<char>::__istream_type’ {aka ‘std::basic_istream<char>’} and ‘<unresolved overloaded function type>’)
    8 |         cin>>a>>b>>c>>d>>e>>f>>t>>endl;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
In file included from /nix/gcc/include/c++/13.3.0/iostream:42,
                 from foo.cc:2:
/nix/gcc/include/c++/13.3.0/istream:325:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  325 |       operator>>(void*& __p)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:325:25: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘void*&’
  325 |       operator>>(void*& __p)
      |                  ~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:224:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  224 |       operator>>(long double& __f)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:224:31: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘long double&’
  224 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:220:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  220 |       operator>>(double& __f)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:220:26: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘double&’
  220 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:216:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  216 |       operator>>(float& __f)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:216:25: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘float&’
  216 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:201:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  201 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:201:38: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘long long unsigned int&’
  201 |       operator>>(unsigned long long& __n)
      |                  ~~~~~~~~~~~~~~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:197:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  197 |       operator>>(long long& __n)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:197:29: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘long long int&’
  197 |       operator>>(long long& __n)
      |                  ~~~~~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:192:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:192:33: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘long unsigned int&’
  192 |       operator>>(unsigned long& __n)
      |                  ~~~~~~~~~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:188:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:188:24: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘long int&’
  188 |       operator>>(long& __n)
      |                  ~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:184:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:184:32: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘unsigned int&’
  184 |       operator>>(unsigned int& __n)
      |                  ~~~~~~~~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:181:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]’
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:181:23: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘int&’
  181 |       operator>>(int& __n);
      |                  ~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:177:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:177:34: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘short unsigned int&’
  177 |       operator>>(unsigned short& __n)
      |                  ~~~~~~~~~~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:174:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]’
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:174:25: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘short int&’
  174 |       operator>>(short& __n);
      |                  ~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:170:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:170:24: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘bool&’
  170 |       operator>>(bool& __n)
      |                  ~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:122:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:122:36: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)’ {aka ‘std::basic_istream<char>& (*)(std::basic_istream<char>&)’}
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:126:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>; __ios_type = std::basic_ios<char>]’
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:126:32: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)’ {aka ‘std::basic_ios<char>& (*)(std::basic_ios<char>&)’}
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |                  ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:133:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  133 |       operator>>(ios_base& (*__pf)(ios_base&))
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:133:30: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘std::ios_base& (*)(std::ios_base&)’
  133 |       operator>>(ios_base& (*__pf)(ios_base&))
      |                  ~~~~~~~~~~~~^~~~~~~~~~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:349:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(__streambuf_type*) [with _CharT = char; _Traits = std::char_traits<char>; __streambuf_type = std::basic_streambuf<char>]’
  349 |       operator>>(__streambuf_type* __sb);
      |       ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:349:36: note:   no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘std::basic_istream<char>::__streambuf_type*’ {aka ‘std::basic_streambuf<char>*’}
  349 |       operator>>(__streambuf_type* __sb);
      |                  ~~~~~~~~~~~~~~~~~~^~~~
In file included from /nix/gcc/include/c++/13.3.0/istream:1106:
/nix/gcc/include/c++/13.3.0/bits/istream.tcc:975:5: note: candidate: ‘std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT&) [with _CharT = char; _Traits = char_traits<char>]’
  975 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |     ^~~~~~~~
/nix/gcc/include/c++/13.3.0/bits/istream.tcc:975:62: note:   no known conversion for argument 2 from ‘<unresolved overloaded function type>’ to ‘char&’
  975 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |                                                      ~~~~~~~~^~~
In file included from /nix/gcc/include/c++/13.3.0/string:55,
                 from /nix/gcc/include/c++/13.3.0/bits/locale_classes.h:40,
                 from /nix/gcc/include/c++/13.3.0/bits/ios_base.h:41,
                 from /nix/gcc/include/c++/13.3.0/ios:44,
                 from /nix/gcc/include/c++/13.3.0/ostream:40,
                 from /nix/gcc/include/c++/13.3.0/iostream:41:
/nix/gcc/include/c++/13.3.0/bits/basic_string.tcc:827:5: 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>&)’
  827 |     operator>>(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~~
/nix/gcc/include/c++/13.3.0/bits/basic_string.tcc:827:5: note:   template argument deduction/substitution failed:
foo.cc:8:35: note:   couldn’t deduce template parameter ‘_Alloc’
    8 |         cin>>a>>b>>c>>d>>e>>f>>t>>endl;
      |                                   ^~~~
/nix/gcc/include/c++/13.3.0/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& __c)
      |     ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:846:5: note:   template argument deduction/substitution failed:
foo.cc:8:35: note:   cannot convert ‘std::endl’ (type ‘<unresolved overloaded function type>’) to type ‘unsigned char&’
    8 |         cin>>a>>b>>c>>d>>e>>f>>t>>endl;
      |                                   ^~~~
/nix/gcc/include/c++/13.3.0/istream:851:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char&)’
  851 |     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
      |     ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:851:5: note:   template argument deduction/substitution failed:
foo.cc:8:35: note:   cannot convert ‘std::endl’ (type ‘<unresolved overloaded function type>’) to type ‘signed char&’
    8 |         cin>>a>>b>>c>>d>>e>>f>>t>>endl;
      |                                   ^~~~
/nix/gcc/include/c++/13.3.0/istream:893:5: note: candidate: ‘std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT*) [with _CharT = char; _Traits = char_traits<char>]’
  893 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |     ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:893:62: note:   no known conversion for argument 2 from ‘<unresolved overloaded function type>’ to ‘char*’
  893 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |                                                      ~~~~~~~~^~~
/nix/gcc/include/c++/13.3.0/istream:936:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char*)’
  936 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
      |     ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:936:5: note:   template argument deduction/substitution failed:
foo.cc:8:35: note:   cannot convert ‘std::endl’ (type ‘<unresolved overloaded function type>’) to type ‘unsigned char*’
    8 |         cin>>a>>b>>c>>d>>e>>f>>t>>endl;
      |                                   ^~~~
/nix/gcc/include/c++/13.3.0/istream:942:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char*)’
  942 |     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
      |     ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:942:5: note:   template argument deduction/substitution failed:
foo.cc:8:35: note:   cannot convert ‘std::endl’ (type ‘<unresolved overloaded function type>’) to type ‘signed char*’
    8 |         cin>>a>>b>>c>>d>>e>>f>>t>>endl;
      |                                   ^~~~
/nix/gcc/include/c++/13.3.0/istream:1096:5: note: candidate: ‘template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&)’
 1096 |     operator>>(_Istream&& __is, _Tp&& __x)
      |     ^~~~~~~~
/nix/gcc/include/c++/13.3.0/istream:1096:5: note:   template argument deduction/substitution failed:
foo.cc:8:35: note:   couldn’t deduce template parameter ‘_Tp’
    8 |         cin>>a>>b>>c>>d>>e>>f>>t>>endl;
      |                                   ^~~~
foo.cc:16:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   16 |         if(b=1&3&5&7&8&10&12)
      |            ~^~~~~~~~~~~~~~~~
foo.cc:21:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   21 |         if(b=4&6&9&11)
      |            ~^~~~~~~~~
foo.cc:24:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   24 |         if(b=2)
      |            ~^~
foo.cc:26:23: warning: left operand of comma operator has no effect [-Wunused-value]
   26 |                 if(a%4==0,c>29)
      |                    ~~~^~~
foo.cc:28:23: warning: left operand of comma operator has no effect [-Wunused-value]
   28 |                 if(a%4!=0,c>28)
      |                    ~~~^~~