Language: C++

#include <iostream>
#include <cmath>
#include <vector>
#include <tr1/unordered_map>

using namespace std;

#define fi first
#define se second

int N;
int hx, hy, mx, my;
typedef pair<double, double> P;
P cs[21];

#define SQ(x) ((x)*(x))
inline double dist(P a, P b) {
  return sqrt(SQ(a.fi-b.fi) + SQ(a.se-b.se));
}

unordered_map<int, double> umap;

double G[22][22];
bool dfs(int S, int now, double cost) {
  
  if(S == (1<<N)-1) {
    return true;
  }
  
  dp[S] = cost;
  
  for(int i=0; i<N; i++) {
    if(S >> i & 1) continue;
    if(G[i][N+1] <= cost+G[now][i]) return false;
  }
  
  for(int i=0; i<N; i++) {
    if(S >> i & 1) continue;
    if(dp.count(S|(1<<i)) && dp[S|(1<<i)] <= cost+G[now][i]) continue;
    if(dfs(S|(1<<i), i, cost+G[now][i]) return true;
  }
  
  return false;
}

bool solve() {
  
  for(int i=0; i<N; i++) {
    for(int j=i+1; j<N; j++) {
      G[i][j] = G[j][i] = dist(cs[i], cs[j]);
    }
    G[N][i] = G[i][N] = dist(P(hx, hy), cs[i]);
    G[N+1][i] = G[i][N+1] = dist(P(mx, my), cs[i]);
  }
  
  for(int i=0; i<N; i++) {
    if(dfs(1<<i, i, 0.)) return true;
  }
  
  return false;
}

int main() {
  while(1) {
    cin >> N >> hx >> hy >> mx >> my;
    if(!N) break;
    for(int i=0; i<N; i++) {
      cin >> cs[i].fi >> cs[i].se << endl;
    }
    cout << (solve() ? "YES" : "NO") << endl;
  }
  
  return 0;
}

Compiler output:
a.cc:21:1: error: 'unordered_map' does not name a type
   21 | unordered_map<int, double> umap;
      | ^~~~~~~~~~~~~
a.cc: In function 'bool dfs(int, int, double)':
a.cc:30:3: error: 'dp' was not declared in this scope
   30 |   dp[S] = cost;
      |   ^~
a.cc:40:40: error: expected ';' before 'return'
   40 |     if(dfs(S|(1<<i), i, cost+G[now][i]) return true;
      |                                        ^~~~~~~
      |                                        ;
a.cc:41:3: error: expected primary-expression before '}' token
   41 |   }
      |   ^
a.cc:40:53: error: expected ')' before '}' token
   40 |     if(dfs(S|(1<<i), i, cost+G[now][i]) return true;
      |       ~                                             ^
      |                                                     )
   41 |   }
      |   ~                                                  
a.cc:41:3: error: expected primary-expression before '}' token
   41 |   }
      |   ^
a.cc: In function 'int main()':
a.cc:68:35: error: no match for 'operator<<' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and '<unresolved overloaded function type>')
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/string_view:763:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, basic_string_view<_CharT, _Traits>)'
  763 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:763:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/bits/basic_string.h:4077:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 4077 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4077:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
In file included from /usr/include/c++/14/bits/memory_resource.h:38,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/cstddef:125:5: note: candidate: 'template<class _IntegerType> constexpr std::__byte_op_t<_IntegerType> std::operator<<(byte, _IntegerType)'
  125 |     operator<<(byte __b, _IntegerType __shift) noexcept
      |     ^~~~~~~~
/usr/include/c++/14/cstddef:125:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   couldn't deduce template parameter '_IntegerType'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
In file included from /usr/include/c++/14/bits/ios_base.h:46:
/usr/include/c++/14/system_error:339:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const error_code&)'
  339 |     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
      |     ^~~~~~~~
/usr/include/c++/14/system_error:339:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:563:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _CharT)'
  563 |     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:563:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:573:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, char)'
  573 |     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:573:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:579:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, char)'
  579 |     operator<<(basic_ostream<char, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:579:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:590:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, signed char)'
  590 |     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:590:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:595:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, unsigned char)'
  595 |     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:595:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:654:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const _CharT*)'
  654 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:654:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
In file included from /usr/include/c++/14/ostream:1022:
/usr/include/c++/14/bits/ostream.tcc:307:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const char*)'
  307 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/bits/ostream.tcc:307:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:671:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const char*)'
  671 |     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:671:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:684:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const signed char*)'
  684 |     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:684:5: note:   template argument deduction/substitution failed:
a.cc:68:38: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
   68 |       cin >> cs[i].fi >> cs[i].se << endl;
      |                                      ^~~~
/usr/include/c++/14/ostream:689:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_o