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Compile Error

foo.cc: In function 'int main()':
foo.cc:13:8: warning: left operand of comma operator has no effect [-Wunused-value]
   13 |  cin>>(s, 100);
      |        ^
foo.cc:13:5: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int')
   13 |  cin>>(s, 100);
      |  ~~~^~~~~~~~~~
      |  |      |
      |  |      int
      |  std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/9/iostream:40,
                 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>]' <near match>
  120 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:120:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:13:9: error: invalid conversion from 'int' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
      |         |
      |         int
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  124 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:124:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:13:9: error: invalid conversion from 'int' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'} [-fpermissive]
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
      |         |
      |         int
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  131 |       operator>>(ios_base& (*__pf)(ios_base&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:131:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:13:9: error: invalid conversion from 'int' to 'std::ios_base& (*)(std::ios_base&)' [-fpermissive]
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
      |         |
      |         int
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'bool&' to an rvalue of type 'bool'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'short int&' to an rvalue of type 'short int'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to an rvalue of type 'short unsigned int'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'unsigned int&' to an rvalue of type 'unsigned int'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'long int&' to an rvalue of type 'long int'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to an rvalue of type 'long unsigned int'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'long long int&' to an rvalue of type 'long long int'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to an rvalue of type 'long long unsigned int'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  214 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:214:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:13:9: error: cannot bind non-const lvalue reference of type 'float&' to an rvalue of type 'float'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  218 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:218:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:13:9: error: cannot bind non-const lvalue reference of type 'double&' to an rvalue of type 'double'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  222 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:222:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:13:9: error: cannot bind non-const lvalue reference of type 'long double&' to an rvalue of type 'long double'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: error: invalid conversion from 'int' to 'void*' [-fpermissive]
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
      |         |
      |         int
foo.cc:13:9: error: cannot bind rvalue '(void*)((void)0, ((long int)100))' to 'void*&'
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  259 |       operator>>(__streambuf_type* __sb);
      |       ^~~~~~~~
/usr/include/c++/9/istream:259:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:13:9: error: invalid conversion from 'int' to 'std::basic_istream<char>::__streambuf_type*' {aka 'std::basic_streambuf<char>*'} [-fpermissive]
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
      |         |
      |         int
foo.cc:13:5: note: candidate: 'operator>>(int, int)' <built-in>
   13 |  cin>>(s, 100);
      |  ~~~^~~~~~~~~~
foo.cc:13:5: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'int'
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/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 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:13:14: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' and 'int'
   13 |  cin>>(s, 100);
      |              ^
In file included from /usr/include/c++/9/istream:991,
                 from /usr/include/c++/9/iostream:40,
                 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:13:14: note:   deduced conflicting types for parameter '_CharT' ('char' and 'int')
   13 |  cin>>(s, 100);
      |              ^
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: note:   cannot convert '((void)0, 100)' (type 'int') to type 'unsigned char&'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: note:   cannot convert '((void)0, 100)' (type 'int') to type 'signed char&'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/istream:991,
                 from /usr/include/c++/9/iostream:40,
                 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:13:14: note:   mismatched types '_CharT2*' and 'int'
   13 |  cin>>(s, 100);
      |              ^
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: note:   cannot convert '((void)0, 100)' (type 'int') to type 'unsigned char*'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:13:9: note:   cannot convert '((void)0, 100)' (type 'int') to type 'signed char*'
   13 |  cin>>(s, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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 = int]':
foo.cc:13:14:   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>&>'
foo.cc:14:8: warning: left operand of comma operator has no effect [-Wunused-value]
   14 |  cin>>(t, 100);
      |        ^
foo.cc:14:5: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int')
   14 |  cin>>(t, 100);
      |  ~~~^~~~~~~~~~
      |  |      |
      |  |      int
      |  std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/9/iostream:40,
                 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>]' <near match>
  120 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:120:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:9: error: invalid conversion from 'int' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
      |         |
      |         int
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  124 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:124:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:9: error: invalid conversion from 'int' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'} [-fpermissive]
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
      |         |
      |         int
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  131 |       operator>>(ios_base& (*__pf)(ios_base&))
      |       ^~~~~~~~
/usr/include/c++/9/istream:131:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:9: error: invalid conversion from 'int' to 'std::ios_base& (*)(std::ios_base&)' [-fpermissive]
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
      |         |
      |         int
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'bool&' to an rvalue of type 'bool'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'short int&' to an rvalue of type 'short int'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to an rvalue of type 'short unsigned int'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'unsigned int&' to an rvalue of type 'unsigned int'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'long int&' to an rvalue of type 'long int'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to an rvalue of type 'long unsigned int'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'long long int&' to an rvalue of type 'long long int'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to an rvalue of type 'long long unsigned int'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  214 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:214:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:9: error: cannot bind non-const lvalue reference of type 'float&' to an rvalue of type 'float'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  218 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:218:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:9: error: cannot bind non-const lvalue reference of type 'double&' to an rvalue of type 'double'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  222 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/9/istream:222:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:9: error: cannot bind non-const lvalue reference of type 'long double&' to an rvalue of type 'long double'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: error: invalid conversion from 'int' to 'void*' [-fpermissive]
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
      |         |
      |         int
foo.cc:14:9: error: cannot bind rvalue '(void*)((void)0, ((long int)100))' to 'void*&'
In file included from /usr/include/c++/9/iostream:40,
                 from foo.cc:1:
/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>]' <near match>
  259 |       operator>>(__streambuf_type* __sb);
      |       ^~~~~~~~
/usr/include/c++/9/istream:259:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:9: error: invalid conversion from 'int' to 'std::basic_istream<char>::__streambuf_type*' {aka 'std::basic_streambuf<char>*'} [-fpermissive]
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
      |         |
      |         int
foo.cc:14:5: note: candidate: 'operator>>(int, int)' <built-in>
   14 |  cin>>(t, 100);
      |  ~~~^~~~~~~~~~
foo.cc:14:5: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'int'
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/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 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:14:14: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' and 'int'
   14 |  cin>>(t, 100);
      |              ^
In file included from /usr/include/c++/9/istream:991,
                 from /usr/include/c++/9/iostream:40,
                 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:14:14: note:   deduced conflicting types for parameter '_CharT' ('char' and 'int')
   14 |  cin>>(t, 100);
      |              ^
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: note:   cannot convert '((void)0, 100)' (type 'int') to type 'unsigned char&'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: note:   cannot convert '((void)0, 100)' (type 'int') to type 'signed char&'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/istream:991,
                 from /usr/include/c++/9/iostream:40,
                 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:14:14: note:   mismatched types '_CharT2*' and 'int'
   14 |  cin>>(t, 100);
      |              ^
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: note:   cannot convert '((void)0, 100)' (type 'int') to type 'unsigned char*'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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:14:9: note:   cannot convert '((void)0, 100)' (type 'int') to type 'signed char*'
   14 |  cin>>(t, 100);
      |       ~~^~~~~~
In file included from /usr/include/c++/9/iostream:40,
                 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 = int]':
foo.cc:14:14:   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>&>'
foo.cc: In function 'int index1(char*, int, char*)':
foo.cc:44:4: error: 'start1' was not declared in this scope; did you mean 'starti'?
   44 |    start1 = start1 + 1, i = start1, j = 0;
      |    ^~~~~~
      |    starti
foo.cc:47:10: error: 'start1' was not declared in this scope; did you mean 'starti'?
   47 |   return start1;
      |          ^~~~~~
      |          starti
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信息

递交者
类型
自测
题目
DS3-1 字符串的模式匹配
语言
C++
递交时间
2022-01-03 23:28:32
评测时间
2022-01-03 23:28:32
评测机
分数
0
总耗时
0ms
峰值内存
0 Bytes