j0,j1,jn,y0,y1,yn都不行

foo.cc:3:25: error: ‘long long int y1’ redeclared as different kind of entity
    3 | long long T,a,b,c,x1,x2,y1,y2,x,y;
      |                         ^~
In file included from /nix/glibc-2.40-66-dev/include/features.h:511,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/x86_64-unknown-linux-gnu/bits/os_defines.h:39,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/x86_64-unknown-linux-gnu/bits/c++config.h:683,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/cassert:43,
                 from stdc++.h:33:
/nix/glibc-2.40-66-dev/include/bits/mathcalls.h:239:1: note: previous declaration ‘double y1(double)’
  239 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
foo.cc: In function ‘int main()’:
foo.cc:14:37: error: no match for ‘operator>>’ (operand types are ‘std::basic_istream<char>::__istream_type’ {aka ‘std::basic_istream<char>’} and ‘double(double) throw ()’ {aka ‘double(double)’})
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                 ~~~~~~~~~~~~~~~~~~~~^~~~
      |                                 |     |
      |                                 |     double(double) throw () {aka double(double)}
      |                                 std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/sstream:40,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/complex:45,
                 from stdc++.h:138:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:170:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:170:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: cannot bind non-const lvalue reference of type ‘bool&’ to a value of type ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’}
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:174:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]’ (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:174:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘short int’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(short int)y1’ to ‘short int&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:177:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:177:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘short unsigned int’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(short unsigned int)y1’ to ‘short unsigned int&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:181:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]’ (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:181:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘int’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(int)y1’ to ‘int&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:184:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:184:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘unsigned int’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(unsigned int)y1’ to ‘unsigned int&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:188:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:188:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘long int’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(long int)y1’ to ‘long int&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:192:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:192:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘long unsigned int’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(long unsigned int)y1’ to ‘long unsigned int&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:199:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:199:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘long long int’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(long long int)y1’ to ‘long long int&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:203:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:203:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘long long unsigned int’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(long long unsigned int)y1’ to ‘long long unsigned int&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:328:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:328:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘void*’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
foo.cc:14:39: error: cannot bind rvalue ‘(void*)y1’ to ‘void*&’
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:122:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:122:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} 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>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:126:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>; __ios_type = std::basic_ios<char>]’ (near match)
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:126:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} 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>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:133:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  133 |       operator>>(ios_base& (*__pf)(ios_base&))
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:133:7: note:   conversion of argument 1 would be ill-formed:
foo.cc:14:39: error: invalid conversion from ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to ‘std::ios_base& (*)(std::ios_base&)’ [-fpermissive]
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
      |                                       |
      |                                       double (*)(double) throw () {aka double (*)(double)}
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:219:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:219:25: note:   no known conversion for argument 1 from ‘double(double) throw ()’ {aka ‘double(double)’} to ‘float&’
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:223:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:223:26: note:   no known conversion for argument 1 from ‘double(double) throw ()’ {aka ‘double(double)’} to ‘double&’
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:227:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:227:31: note:   no known conversion for argument 1 from ‘double(double) throw ()’ {aka ‘double(double)’} to ‘long double&’
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:352:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(__streambuf_type*) [with _CharT = char; _Traits = std::char_traits<char>; __streambuf_type = std::basic_streambuf<char>]’
  352 |       operator>>(__streambuf_type* __sb);
      |       ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:352:36: note:   no known conversion for argument 1 from ‘double(double) throw ()’ {aka ‘double(double)’} to ‘std::basic_istream<char>::__streambuf_type*’ {aka ‘std::basic_streambuf<char>*’}
  352 |       operator>>(__streambuf_type* __sb);
      |                  ~~~~~~~~~~~~~~~~~~^~~~
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/string:55,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bitset:52,
                 from stdc++.h:52:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/basic_string.tcc:835:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
  835 |     operator>>(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/basic_string.tcc:835:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘double(double) throw ()’ {aka ‘double(double)’}
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bitset:1597:5: note: candidate: ‘template<class _CharT, class _Traits, long unsigned int _Nb> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, bitset<_Nb>&)’
 1597 |     operator>>(std::basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bitset:1597:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   mismatched types ‘std::bitset<_Nb>’ and ‘double(double) throw ()’ {aka ‘double(double)’}
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:1109:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/istream.tcc:978:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT&)’
  978 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/istream.tcc:978:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   deduced conflicting types for parameter ‘_CharT’ (‘char’ and ‘double(double) throw ()’ {aka ‘double(double)’})
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:849:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char&)’
  849 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:849:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘unsigned char&’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:854:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char&)’
  854 |     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:854:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘signed char&’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:896:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT*)’
  896 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:896:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   deduced conflicting types for parameter ‘_CharT’ (‘char’ and ‘double(double) throw ()’ {aka ‘double(double)’})
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:939:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char*)’
  939 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:939:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘unsigned char*’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:945:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char*)’
  945 |     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/istream:945:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘signed char*’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/complex:509:5: note: candidate: ‘template<class _Tp, class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, complex<_Tp>&)’
  509 |     operator>>(basic_istream<_CharT, _Traits>& __is, complex<_Tp>& __x)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/complex:509:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   mismatched types ‘std::complex<_Tp>’ and ‘double(double) throw ()’ {aka ‘double(double)’}
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
In file included from stdc++.h:143:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:76:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Resetiosflags)’
   76 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Resetiosflags __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:76:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘std::_Resetiosflags’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:106:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setiosflags)’
  106 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setiosflags __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:106:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘std::_Setiosflags’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:137:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setbase)’
  137 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setbase __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:137:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘std::_Setbase’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:177:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setfill<_CharT>)’
  177 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setfill<_CharT> __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:177:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   mismatched types ‘std::_Setfill<_CharT>’ and ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’}
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:207:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setprecision)’
  207 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setprecision __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:207:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘std::_Setprecision’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:237:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _Setw)’
  237 |     operator>>(basic_istream<_CharT, _Traits>& __is, _Setw __f)
      |     ^~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/iomanip:237:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   cannot convert ‘y1’ (type ‘double(double) throw ()’ {aka ‘double(double)’}) to type ‘std::_Setw’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
In file included from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:605,
                 from stdc++.h:166:
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/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 _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)’
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, struct std::__shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   ‘std::basic_istream<char>::__istream_type’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/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 _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)’
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, struct std::__shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   ‘std::basic_istream<char>::__istream_type’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/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 _Expr<_Dom1, typename _Dom1::value_type>&)’
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, struct std::__shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   mismatched types ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’ and ‘double(double) throw ()’ {aka ‘double(double)’}
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/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 _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)’
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, struct std::__shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   ‘std::basic_istream<char>::__istream_type’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/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 valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)’
  414 |     _DEFINE_EXPR_BINARY_OPERATOR(>>, struct std::__shift_right)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   mismatched types ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’ and ‘double(double) throw ()’ {aka ‘double(double)’}
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1205:1: 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 valarray<_Tp>&, const valarray<_Tp>&)’
 1205 | _DEFINE_BINARY_OPERATOR(>>, __shift_right)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1205:1: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   ‘std::basic_istream<char>::__istream_type’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::valarray<_Tp>’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1205:1: 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 valarray<_Tp>&, const typename valarray<_Tp>::value_type&)’
 1205 | _DEFINE_BINARY_OPERATOR(>>, __shift_right)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1205:1: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   ‘std::basic_istream<char>::__istream_type’ {aka ‘std::basic_istream<char>’} is not derived from ‘const std::valarray<_Tp>’
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1205:1: 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 valarray<_Tp>::value_type&, const valarray<_Tp>&)’
 1205 | _DEFINE_BINARY_OPERATOR(>>, __shift_right)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/valarray:1205:1: note:   template argument deduction/substitution failed:
foo.cc:14:39: note:   mismatched types ‘const std::valarray<_Tp>’ and ‘double(double) throw ()’ {aka ‘double(double)’}
   14 |                 cin>>a>>b>>c>>x1>>x2>>y1>>y2;
      |                                       ^~
foo.cc:15:29: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   15 |                 if(x2<x1||y2<y1){cout<<"0\n";continue;}
      |                           ~~^~~
foo.cc:22:39: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   22 |                 while(x1<=x&&x<=x2&&y1<=y&&y<=y2)
      |                                     ~~^~~
foo.cc:26:39: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   26 |                 while(x1<=x&&x<=x2&&y1<=y&&y<=y2)

报错信息比代码还长

我之前也被这玩意儿坑过。

66

往年有很多选手联赛因为这个翻车