Language: C++

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define F(i,a,b) for(int i=a;i<=b;++i)
#define R(i,a,b) for(int i=a;i<b;++i)
#define mem(a,b) memset(a,b,sizeof(a))
const double pi = acos(-1.0);
double x1,y1,x2,y2;
int n;

double ans=0;
struct node
{
   int x,y;
   bool operator<(const node &p)const
   {
      return (x==p.x)?y<p.y:x<p.x;
   }
}a[200200];
double c[200200];
int main()
{
   cin>>x1>>y1>>x2>>y2;
   ans=(abs(x1-x2)+abs(y1-y2))*(100);
   double X1=min(x1,x2),X2=max(x1,x2),Y1=min(y1,y2),Y2=max(y1,y2);
   cin>>n;
   int length=0;
   F(i,1,n)
   {
      double x,y;
      cin>>x>>y;
      if((x>=X1)&&(x<=X2)&&(y>=Y1)&&(y<=Y2)) a[++length].x=x,a[length].y=y;
   }
   n=length;
   if(n==0)
   {
      cout<<ans<<endl;return 0;
   }
   sort(a+1,a+1+n);
   F(i,1,n) c[i]=a[i].y;
   int len=1;
   F(i,2,n)
   {
      if(c[len]<=c[i]) c[++len]=c[i];
      else c[lower_bound(c+1,c+1+len,c[i])-c]=c[i];
   }
   ans=ans-(20-5*pi)*len;
   int check=min(abs(y1-y2),abs(x1-x2))+1;
   if(len==check)  { ans=ans+(20-5*pi)+10*pi-20; }
   cout<<ans<<endl;
   return 0;
}

Compiler output:
a.cc:9:11: error: 'double y1' redeclared as different kind of entity
    9 | double x1,y1,x2,y2;
      |           ^~
In file included from /usr/include/features.h:523,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/c++config.h:683,
                 from /usr/include/c++/14/cassert:43,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:33,
                 from a.cc:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:257:1: note: previous declaration 'double y1(double)'
  257 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:24:11: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   24 |    cin>>x1>>y1>>x2>>y2;
      |    ~~~~~~~^~~~
      |       |     |
      |       |     double(double) noexcept
      |       std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/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)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
/usr/include/c++/14/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);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(short int)y1' to 'short int&'
/usr/include/c++/14/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)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(short unsigned int)y1' to 'short unsigned int&'
/usr/include/c++/14/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);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(int)y1' to 'int&'
/usr/include/c++/14/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)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(unsigned int)y1' to 'unsigned int&'
/usr/include/c++/14/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)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(long int)y1' to 'long int&'
/usr/include/c++/14/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)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(long unsigned int)y1' to 'long unsigned int&'
/usr/include/c++/14/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)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(long long int)y1' to 'long long int&'
/usr/include/c++/14/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)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(long long unsigned int)y1' to 'long long unsigned int&'
/usr/include/c++/14/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)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
a.cc:24:13: error: cannot bind rvalue '(void*)y1' to 'void*&'
/usr/include/c++/14/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&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
/usr/include/c++/14/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&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:126:7: note:   conversion of argument 1 would be ill-formed:
a.cc:24:13: error: invalid conversion from 'double (*)(double) noexcept' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'} [-fpermissive]
   24 |    cin>>x1>>y1>>x2>>y2;
      |             ^~
      |             |
      |             double (*)(double) noexcept
/usr/include/c++/14/istream:133:7: note: candidate: 'std::basic_istream<_Cha