Language: C++

#include<iostream>
#include<complex>
#include<cmath>
#include<vector>

#define X real()
#define Y imag()

using namespace std;

typedef complex<double>P;
typedef vector<P>POL;

const double INF = 1e12;

namespace std{
  bool operator < (const P&a, const P& b){
    return real(a) != real(b) ? real(a) < real(b) : imag(a) < imag(b);
  }
}

struct Data{
  P p;
  bool mine,up;
  bool operator < (const Data &d)const{
    return p < d.p;
  }
};

struct L : public POL{
  L(){};
  bool mine,up;
  L(const P &a, const P &b){
    push_back(a); push_back(b);
  }
};

double cross(const P& a, const P& b){
  return imag(conj(a)*b);
}

double dot(const P& a, const P&b){
  return real(conj(a)*b);
}

int ccw(P a,P b,P c){
  b -= a; c -= a;
  if(cross(b,c) > 0)return 1;
  if(cross(b,c) < 0) return -1;
  if(dot(b,c) < 0) return 2;
  if(norm(b) < norm(c))return -2;
  return 0;
}

bool intersectSS(const L &s,const L&t){
  return ccw(s[0],s[1],t[0])*ccw(s[0],s[1],t[1]) <= 0 &&
    ccw(t[0],t[1],s[0])*ccw(t[0],t[1],s[1]) <= 0;
}

P intersection_ss(L line1, L line2){
  if(!intersectSS(line1,line2))return P(INF,INF);
  P a = line1[1] - line1[0]; P b = line2[1] - line2[0];
  return line1[0] + a * cross(b,line2[0]-line1[0]) / cross(b,a);
}

vector<Data>vec;
L line;

void input(){
  P p1,p2;
  cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
  line = L(p1,p2);
  line.mine = true;

  int n;
  cin >> n;
  for(int i = 0 ; i < n ; i++){
    cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
    L l = L(p1,p2);
    cin >> l.mine >> l.up;
    if(intersectSS(line,l)){
      Data d;
      d.p = intersection_ss(line,l);
      d.mine = l.mine;
      d.up = l.up;
      vec.push_back(d);
    }
  }
}

int solve(){
  vec.clear();
  input();

  bool up;
  int res = 0;


  if(vec.size() == 0)return 0;

  sort(vec.begin(),vec.end());
  
  if(vec[0].mine) up = vec[0].up;
  else up = !vec[0].up;

  for(int i = 1 ; i < vec.size() ; i++){
    if(vec[i].mine){
      if(up != vec[i].up){
	up = !up;
	res++;
      }
    }
    else {
      if(up == vec[i].up){
	up = !up;
	res++;
      }
    }
  }
  return res;
}

int main(){
  int tc;
  cin >> tc;
  while(tc--){
    cout << solve() << endl;
  }
  return 0;
}

Compiler output:
a.cc: In function 'void input()':
a.cc:71:7: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'double')
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |   ~~~ ^~
      |   |
      |   std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/iostream:42,
                 from a.cc:1:
/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:6:15: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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:6:15: error: cannot bind non-const lvalue reference of type 'short int&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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:6:15: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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:6:15: error: cannot bind non-const lvalue reference of type 'int&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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:6:15: error: cannot bind non-const lvalue reference of type 'unsigned int&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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:6:15: error: cannot bind non-const lvalue reference of type 'long int&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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:6:15: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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:6:15: error: cannot bind non-const lvalue reference of type 'long long int&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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:6:15: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/usr/include/c++/14/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>]' (near match)
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:15: error: cannot bind non-const lvalue reference of type 'float&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/usr/include/c++/14/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>]' (near match)
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:15: error: cannot bind non-const lvalue reference of type 'double&' to an rvalue of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/usr/include/c++/14/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>]' (near match)
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:15: error: cannot bind non-const lvalue reference of type 'long double&' to a value of type 'double'
    6 | #define X real()
      |               ^
a.cc:71:13: note: in expansion of macro 'X'
   71 |   cin >> p1.X >> p1.Y >> p2.X >> p2.Y;
      |             ^
/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>]'
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:25: note:   no known conversion for argument 1 from 'double' to 'void*&'
  328 |       operator>>(void*& __p)
      |                  ~~~~~~~^~~
/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>]'
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:36: note:   no known conversion for argument 1 from 'double' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'}
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/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