Language: C++

// avvinci - sem_7 
// #include"prettyprint.hpp"
#include<bits/stdc++.h>
using namespace std;

typedef pair<long long int , long long int> P;

#define mod 1000000007 
#define pb push_back
#define mk make_pair
#define fs first
#define sc second
#define ll long long int
#define fr(it,st,en) for(it=st;it<en;it++)
#define all(container) container.begin(),container.end()
#define INP ios_base::sync_with_stdio(false);cin.tie(NULL);
#define ws(x) cout << #x << " = " << x << endl
#define sz(x)  (ll)x.size()
#define N 1000004

const double PI  =3.141592653589793238463;
const long long infl = 1e18+5;

ll n,m,k,q,x,y,f,val,t=1,i,j;
ll ind = -1,cnt,sz,sm,ans,mx = -1,mn = infl ;
ll a[N] ;
vector< P > v ; 
ll x1,y1,x2,y2 ; 
bool cmp (P a, P b ){
  ll c = min(a.fs ,a.sc)  ;
  ll d = min( b.fs , b.sc ) ; 
  return (c < d ) ; 
}

ll rec(int ind ,ll x, ll y ){
  if(v.empty() || ind >= v.size() ) return 0 ;
  if(v[ind].fs >= x && v[ind].sc >= y ) {
    return (1 + rec(ind+1,v[ind].fs , v[ind].sc)) ; 
  } 
  else
    return rec(ind+1,x,y)  ; 

}
int main(){
INP
if (fopen("inp.txt", "r")) {
    freopen("myfile.txt","w",stdout);
    freopen("inp.txt", "r", stdin);
}

cin>>x1>>y1>>x2>>y2 ; 
cin>>n;
double ans  = 0.0  ; 
ans = (max(x1,x2) -min(x1,x2))*100 + (max(y1 ,y2)- min(y1,y2) ) *100  ;

fr(i,0,n){
  cin>>x>>y ; 
  if(x >= min(x1,x2) && x <= max(x1, x2)  && y >= min(y1,y2)  && y <= max(y1 ,y2)) {
        cnt++ ; 
        v.pb({x,y}) ; 
  }
}

if(x1 == x2 || y1 == y2) {
  if(cnt > 0 ){
    ans -= 2*10  ;
    ans += PI*10  ; 
  }
}
else{
    sort(all(v) ,cmp ) ; 

    ll re =  rec(0,0,0) ; 
   
    // ws(re);
    ans -= 20*re ; 
    ans += PI*10*0.5*re ;  
}
cout<<fixed<<setprecision(12)<<ans; 

return 0 ;
}

Compiler output:
a.cc:28:7: error: 'long long int y1' redeclared as different kind of entity
   28 | ll 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:3:
/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:51:8: error: no match for 'operator>>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'double(double) noexcept')
   51 | 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:51:10: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double (*)(double) noexcept'
   51 | 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'short int' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'short unsigned int' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'int' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'unsigned int' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'long int' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'long unsigned int' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'long long int' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'long long unsigned int' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: error: invalid conversion from 'double (*)(double) noexcept' to 'void*' [-fpermissive]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
a.cc:51:10: 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:51:10: 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]
   51 | 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:51:10: 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]
   51 | cin>>x1>>y1>>x2>>y2 ;
      |          ^~
      |          |
      |          double (*)(double) noexcept
/usr/include/c++/14/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; _Trait