answer.code:21:22: error: ‘long double y1’ redeclared as different kind of entity
   21 | long double x1,x2,x3,y1,y2,y3,lx,hx,m1x,m2x,ly,hy,m1y,m2y,f1,f2,x,y,d1,d2,ans;
      |                      ^~
In file included from /usr/include/features.h:424,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/c++config.h:571,
                 from /usr/include/c++/11/cassert:43,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:33,
                 from answer.code:1:
/usr/include/x86_64-linux-gnu/bits/math-finite.h:100:1: note: previous declaration ‘double y1(double)’
  100 | __MATH_REDIRCALL (y1, , (_Mdouble_));
      | ^~~~~~~~~~~~~~~~
answer.code: In function ‘long double distance(long double, long double)’:
answer.code:24:45: error: invalid operands of types ‘double(double) throw ()’ {aka ‘double(double)’} and ‘long double’ to binary ‘operator-’
   24 |     long double d=sqrt(max((x1-x)*(x1-x)+(y1-y)*(y1-y),max((x2-x)*(x2-x)+(y2-y)*(y2-y),(x3-x)*(x3-x)+(y3-y)*(y3-y))));
      |                                           ~~^~
      |                                           |  |
      |                                           |  long double
      |                                           double(double) throw () {aka double(double)}
answer.code:24:52: error: invalid operands of types ‘double(double) throw ()’ {aka ‘double(double)’} and ‘long double’ to binary ‘operator-’
   24 |     long double d=sqrt(max((x1-x)*(x1-x)+(y1-y)*(y1-y),max((x2-x)*(x2-x)+(y2-y)*(y2-y),(x3-x)*(x3-x)+(y3-y)*(y3-y))));
      |                                                  ~~^~
      |                                                  |  |
      |                                                  |  long double
      |                                                  double(double) throw () {aka double(double)}
answer.code: In function ‘int main()’:
answer.code:36:16: 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)’})
   36 |         cin>>x1>>y1>>x2>>y2>>x3>>y3;
      |         ~~~~~~~^~~~
      |            |     |
      |            |     double(double) throw () {aka double(double)}
      |            std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/11/sstream:38,
                 from /usr/include/c++/11/complex:45,
                 from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from answer.code:1:
/usr/include/c++/11/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++/11/istream:120:7: note:   conversion of argument 1 would be ill-formed:
answer.code:36:18: 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]
   36 |         cin>>x1>>y1>>x2>>y2>>x3>>y3;
      |                  ^~
      |                  |
      |                  double (*)(double) throw () {aka double (*)(double)}
In file included from /usr/include/c++/11/sstream:38,
                 from /usr/include/c++/11/complex:45,
                 from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from answer.code:1:
/usr/include/c++/11/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++/11/istream:124:7: note:   conversion of argument 1 would be ill-formed:
answer.code:36:18: 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]
   36 |         cin>>x1>>y1>>x2>>y2>>x3>>y...