Compile Error

foo.cc: In function 'int main()':
foo.cc:6:8: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'const char [2]')
    6 |  cin>>a>>",">>b;
      |  ~~~~~~^~~~~
      |     |    |
      |     |    const char [2]
      |     std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:168:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' <near match>
  168 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/9/istream:168:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: cannot bind non-const lvalue reference of type 'bool&' to an rvalue of type 'bool'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:172:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' <near match>
  172 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/9/istream:172:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const char*' to 'short int' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const char*
foo.cc:6:10: error: cannot bind rvalue '(short int)((const char*)",")' to 'short int&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:175:7: 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>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' <near match>
  175 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/9/istream:175:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const char*' to 'short unsigned int' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const char*
foo.cc:6:10: error: cannot bind rvalue '(short unsigned int)((const char*)",")' to 'short unsigned int&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:179:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' <near match>
  179 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/9/istream:179:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const char*
foo.cc:6:10: error: cannot bind rvalue '(int)((const char*)",")' to 'int&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:182:7: 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>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' <near match>
  182 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/9/istream:182:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const char*' to 'unsigned int' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const char*
foo.cc:6:10: error: cannot bind rvalue '(unsigned int)((const char*)",")' to 'unsigned int&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:186:7: 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>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' <near match>
  186 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/9/istream:186:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const char*' to 'long int' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const char*
foo.cc:6:10: error: cannot bind rvalue '(long int)((const char*)",")' to 'long int&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:190:7: 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>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' <near match>
  190 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/9/istream:190:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const char*' to 'long unsigned int' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const char*
foo.cc:6:10: error: cannot bind rvalue '(long unsigned int)((const char*)",")' to 'long unsigned int&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:195:7: 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>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' <near match>
  195 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/9/istream:195:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const char*' to 'long long int' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const char*
foo.cc:6:10: error: cannot bind rvalue '(long long int)((const char*)",")' to 'long long int&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:199:7: 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>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' <near match>
  199 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/9/istream:199:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const char*' to 'long long unsigned int' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const char*
foo.cc:6:10: error: cannot bind rvalue '(long long unsigned int)((const char*)",")' to 'long long unsigned int&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:235:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' <near match>
  235 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/9/istream:235:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:6:10: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
    6 |  cin>>a>>",">>b;
      |          ^~~
      |          |
      |          const void*
foo.cc:6:10: error: cannot bind rvalue '(void*)((const void*)((const char*)","))' to 'void*&'
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:120:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_CharT, _Traits>::__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
  120 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:120:36: note:   no known conversion for argument 1 from 'const char [2]' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'}
  120 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/istream:124:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__ios_type& (*)(std::basic_istream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::__ios_type = std::basic_ios<char>]'
  124 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:124:32: note:   no known conversion for argument 1 from 'const char [2]' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'}
  124 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |                  ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/9/istream:131:7: 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>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
  131 |       operator>>(ios_base& (*__pf)(ios_base&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:131:30: note:   no known conversion for argument 1 from 'const char [2]' to 'std::ios_base& (*)(std::ios_base&)'
  131 |       operator>>(ios_base& (*__pf)(ios_base&))
      |                  ~~~~~~~~~~~~^~~~~~~~~~~~~~~~
/usr/include/c++/9/istream:214:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
  214 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:214:25: note:   no known conversion for argument 1 from 'const char [2]' to 'float&'
  214 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/usr/include/c++/9/istream:218:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
  218 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:218:26: note:   no known conversion for argument 1 from 'const char [2]' to 'double&'
  218 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/usr/include/c++/9/istream:222:7: 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>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]'
  222 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:222:31: note:   no known conversion for argument 1 from 'const char [2]' to 'long double&'
  222 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/9/istream:259:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__streambuf_type*) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__streambuf_type = std::basic_streambuf<char>]'
  259 |       operator>>(__streambuf_type* __sb);
      |       ^~~~~~~~
/usr/include/c++/9/istream:259:36: note:   no known conversion for argument 1 from 'const char [2]' to 'std::basic_istream<char>::__streambuf_type*' {aka 'std::basic_streambuf<char>*'}
  259 |       operator>>(__streambuf_type* __sb);
      |                  ~~~~~~~~~~~~~~~~~~^~~~
In file included from /usr/include/c++/9/string:56,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/basic_string.tcc:1466:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
 1466 |     operator>>(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~~
/usr/include/c++/9/bits/basic_string.tcc:1466:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/istream:991,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/istream.tcc:931:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)'
  931 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |     ^~~~~~~~
/usr/include/c++/9/bits/istream.tcc:931:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   deduced conflicting types for parameter '_CharT' ('char' and 'const char [2]')
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:756:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)'
  756 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
      |     ^~~~~~~~
/usr/include/c++/9/istream:756:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'unsigned char&'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:761:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)'
  761 |     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
      |     ^~~~~~~~
/usr/include/c++/9/istream:761:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'signed char&'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/istream:991,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/bits/istream.tcc:963:5: note: candidate: 'template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)'
  963 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/9/bits/istream.tcc:963:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   deduced conflicting types for parameter '_CharT2' ('char' and 'const char')
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:803:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)'
  803 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
      |     ^~~~~~~~
/usr/include/c++/9/istream:803:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'unsigned char*'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:808:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*)'
  808 |     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
      |     ^~~~~~~~
/usr/include/c++/9/istream:808:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'signed char*'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/istream:980:5: note: candidate: 'template<class _Istream, class _Tp> typename std::enable_if<std::__and_<std::__not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_istream<_Istream>, std::__is_extractable<typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type, _Tp&&, void> >::value, typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type>::type std::operator>>(_Istream&&, _Tp&&)'
  980 |     operator>>(_Istream&& __is, _Tp&& __x)
      |     ^~~~~~~~
/usr/include/c++/9/istream:980:5: note:   template argument deduction/substitution failed:
/usr/include/c++/9/istream: In substitution of 'template<class _Istream, class _Tp> typename std::enable_if<std::__and_<std::__not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_istream<_Istream>, std::__is_extractable<typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type, _Tp&&, void> >::value, typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type>::type std::operator>>(_Istream&&, _Tp&&) [with _Istream = std::basic_istream<char>&; _Tp = const char (&)[2]]':
foo.cc:6:10:   required from here
/usr/include/c++/9/istream:980:5: error: no type named 'type' in 'struct std::enable_if<false, std::basic_istream<char>&>'
In file included from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from foo.cc:1:
/usr/include/c++/9/complex:498:5: note: candidate: 'template<class _Tp, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::complex<_Tp>&)'
  498 |     operator>>(basic_istream<_CharT, _Traits>& __is, complex<_Tp>& __x)
      |     ^~~~~~~~
/usr/include/c++/9/complex:498:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::complex<_Tp>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:66,
                 from foo.cc:1:
/usr/include/c++/9/bitset:1470:5: note: candidate: 'template<class _CharT, class _Traits, long unsigned int _Nb> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::bitset<_Nb>&)'
 1470 |     operator>>(std::basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x)
      |     ^~~~~~~~
/usr/include/c++/9/bitset:1470:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::bitset<_Nb>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from foo.cc:1:
/usr/include/c++/9/iomanip:71:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Resetiosflags)'
   71 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Resetiosflags __f)
      |     ^~~~~~~~
/usr/include/c++/9/iomanip:71:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'std::_Resetiosflags'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from foo.cc:1:
/usr/include/c++/9/iomanip:101:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Setiosflags)'
  101 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setiosflags __f)
      |     ^~~~~~~~
/usr/include/c++/9/iomanip:101:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'std::_Setiosflags'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from foo.cc:1:
/usr/include/c++/9/iomanip:132:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Setbase)'
  132 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setbase __f)
      |     ^~~~~~~~
/usr/include/c++/9/iomanip:132:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'std::_Setbase'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from foo.cc:1:
/usr/include/c++/9/iomanip:170:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Setfill<_CharT>)'
  170 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setfill<_CharT> __f)
      |     ^~~~~~~~
/usr/include/c++/9/iomanip:170:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::_Setfill<_CharT>' and 'const char*'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from foo.cc:1:
/usr/include/c++/9/iomanip:200:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Setprecision)'
  200 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setprecision __f)
      |     ^~~~~~~~
/usr/include/c++/9/iomanip:200:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'std::_Setprecision'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from foo.cc:1:
/usr/include/c++/9/iomanip:230:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Setw)'
  230 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setw __f)
      |     ^~~~~~~~
/usr/include/c++/9/iomanip:230:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'std::_Setw'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from foo.cc:1:
/usr/include/c++/9/iomanip:264:5: note: candidate: 'template<class _CharT, class _Traits, class _MoneyT> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Get_money<_MoneyT>)'
  264 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Get_money<_MoneyT> __f)
      |     ^~~~~~~~
/usr/include/c++/9/iomanip:264:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::_Get_money<_MoneyT>' and 'const char*'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from foo.cc:1:
/usr/include/c++/9/iomanip:418:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::_Get_time<_CharT>)'
  418 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Get_time<_CharT> __f)
      |     ^~~~~~~~
/usr/include/c++/9/iomanip:418:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::_Get_time<_CharT>' and 'const char*'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/valarray:603,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:414:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__shift_right, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__shift_right, typename _Dom1::value_type>::result_type> std::operator>>(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)'
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, __shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/valarray:603,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:414:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_right, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__shift_right, typename _Dom1::value_type>::result_type> std::operator>>(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, __shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/valarray:603,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:414:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_right, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__shift_right, typename _Dom1::value_type>::result_type> std::operator>>(const typename _Dom::value_type&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)'
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, __shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/valarray:603,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:414:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_right, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__shift_right, typename _Dom1::value_type>::result_type> std::operator>>(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)'
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, __shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/valarray:603,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:414:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_right, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__shift_right, typename _Dom1::value_type>::result_type> std::operator>>(const std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)'
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, __shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1194:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_right, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__shift_right, _Tp>::result_type> std::operator>>(const std::valarray<_Tp>&, const std::valarray<_Tp>&)'
 1194 | _DEFINE_BINARY_OPERATOR(>>, __shift_right)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/valarray:1194:1: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::valarray<_Tp>'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1194:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_right, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__shift_right, _Tp>::result_type> std::operator>>(const std::valarray<_Tp>&, const typename std::valarray<_Tp>::value_type&)'
 1194 | _DEFINE_BINARY_OPERATOR(>>, __shift_right)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/valarray:1194:1: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::valarray<_Tp>'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
                 from foo.cc:1:
/usr/include/c++/9/valarray:1194:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_right, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__shift_right, _Tp>::result_type> std::operator>>(const typename std::valarray<_Tp>::value_type&, const std::valarray<_Tp>&)'
 1194 | _DEFINE_BINARY_OPERATOR(>>, __shift_right)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/valarray:1194:1: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'const std::valarray<_Tp>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:898:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::uniform_int_distribution<_IntType>&)'
  898 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:898:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::uniform_int_distribution<_IntType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:960:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::uniform_real_distribution<_IntType>&)'
  960 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:960:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::uniform_real_distribution<_IntType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2157:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::cauchy_distribution<_RealType>&)'
 2157 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2157:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::cauchy_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:49,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.h:3714:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::bernoulli_distribution&)'
 3714 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.h:3714:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   cannot convert '","' (type 'const char [2]') to type 'std::bernoulli_distribution&'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1104:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::geometric_distribution<_IntType>&)'
 1104 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1104:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::geometric_distribution<_IntType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1760:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::exponential_distribution<_RealType>&)'
 1760 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1760:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::exponential_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2556:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::weibull_distribution<_RealType>&)'
 2556 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2556:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::weibull_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2632:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::extreme_value_distribution<_RealType>&)'
 2632 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2632:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::extreme_value_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:176:5: note: candidate: 'template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::linear_congruential_engine<_UIntType, __a, __c, __m>&)'
  176 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:176:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::linear_congruential_engine<_UIntType, __a, __c, __m>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:504:5: note: candidate: 'template<class _UIntType1, long unsigned int __w1, long unsigned int __n1, long unsigned int __m1, long unsigned int __r1, _UIntType1 __a1, long unsigned int __u1, _UIntType1 __d1, long unsigned int __s1, _UIntType1 __b1, long unsigned int __t1, _UIntType1 __c1, long unsigned int __l1, _UIntType1 __f1, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f>&)'
  504 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:504:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:657:5: note: candidate: 'template<class _UIntType, long unsigned int __w, long unsigned int __s, long unsigned int __r, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::subtract_with_carry_engine<_UIntType, __w, __s, __r>&)'
  657 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:657:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::subtract_with_carry_engine<_UIntType, __w, __s, __r>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:725:5: note: candidate: 'template<class _RandomNumberEngine, long unsigned int __p, long unsigned int __r, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::discard_block_engine<_RandomNumberEngine, __p, __r>&)'
  725 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:725:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::discard_block_engine<_RandomNumberEngine, __p, __r>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:856:5: note: candidate: 'template<class _RandomNumberEngine, long unsigned int __k, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::shuffle_order_engine<_RandomNumberEngine, __k>&)'
  856 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:856:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::shuffle_order_engine<_RandomNumberEngine, __k>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1220:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::negative_binomial_distribution<_IntType>&)'
 1220 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1220:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::negative_binomial_distribution<_IntType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1431:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::poisson_distribution<_IntType>&)'
 1431 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1431:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::poisson_distribution<_IntType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1699:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::binomial_distribution<_IntType>&)'
 1699 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1699:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::binomial_distribution<_IntType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1931:5: note: candidate: 'template<class _RealType1, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::normal_distribution<_RealType>&)'
 1931 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1931:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::normal_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1998:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::lognormal_distribution<_RealType>&)'
 1998 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1998:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::lognormal_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2070:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::chi_squared_distribution<_RealType>&)'
 2070 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2070:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::chi_squared_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2235:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::fisher_f_distribution<_RealType>&)'
 2235 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2235:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::fisher_f_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2309:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::student_t_distribution<_RealType>&)'
 2309 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2309:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::student_t_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2479:5: note: candidate: 'template<class _RealType1, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::gamma_distribution<_RealType>&)'
 2479 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2479:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::gamma_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2792:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::discrete_distribution<_IntType>&)'
 2792 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2792:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::discrete_distribution<_IntType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:3001:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::piecewise_constant_distribution<_RealType>&)'
 3001 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:3001:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::piecewise_constant_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
In file included from /usr/include/c++/9/random:51,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
                 from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:3209:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::piecewise_linear_distribution<_RealType>&)'
 3209 |     operator>>(std::basic_istream<_CharT, _Traits>& __is,
      |     ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:3209:5: note:   template argument deduction/substitution failed:
foo.cc:6:10: note:   mismatched types 'std::piecewise_linear_distribution<_RealType>' and 'const char [2]'
    6 |  cin>>a>>",">>b;
      |          ^~~
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信息

递交者
类型
递交
题目
P1009 数据交换
语言
C++
递交时间
2022-07-19 23:12:28
评测时间
2022-07-19 23:12:28
评测机
分数
0
总耗时
0ms
峰值内存
0 Bytes