Language: C++

#include<bits/stdc++.h>
#define x real()
#define y imag()
using namespace std;
typedef complex<double> P;

int n;
double r,d;
P p[20];
double dp[10001][20][20];

bool check(int a,int b,int c){
  if(b==c)return 0;
  if(a==b)return 1;
  P o=p[b]-p[a],s=p[c]-p[b];
  s*=conj(o);
  return real(s/abs(s))>=cos(M_PI*d/180);
}

int main(){
  cin>>n>>r>>d;
  for(int i=0;i<n;i++)cin>>p[i].x>>p[i].y;

  for(int i=0;i<=r;i++)
    for(int j=0;j<n;j++)
      for(int k=0;k<n;k++)dp[i][j][k]=1e9;
  dp[0][0][0]=0;

  for(int i=0;i<=r;i++)
    for(int j=0;j<n;j++)
      for(int k=0;k<n;k++)
	for(int l=0;l<n;l++)
	  if(check(j,k,l))
	    dp[i+1][k][l]=min(dp[i+1][k][l],dp[i][j][k]+abs(p[k]-p[l]));

  int ans=0;
  for(int i=1;i<=r;i++)
    for(int j=0;j<n;j++)
      for(int k=0;k<n;k++)
	if(dp[i][j][k]<=r)ans=i;
  cout<<ans<<endl;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:26: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'double')
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].y;
      |                       ~~~^~
      |                       |
      |                       std::istream {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,
                 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:2:15: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'short int&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'int&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'unsigned int&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'long int&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'long long int&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'float&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'double&' to an rvalue of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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:2:15: error: cannot bind non-const lvalue reference of type 'long double&' to a value of type 'double'
    2 | #define x real()
      |               ^
a.cc:22:33: note: in expansion of macro 'x'
   22 |   for(int i=0;i<n;i++)cin>>p[i].x>>p[i].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& (*