Language: C++

#include <bits/stdc++.h>
using namespace std;
vector<int> vec(4);
int main() {
  cin >> vec.at(0);
  cin >> vec.at(1);
  cin >> vec.at(2);
  cin >> vec.at(3);
  if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
  cout << "YES";
  }else{
  cout << "NO";
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:44: error: no match for 'operator&&' (operand types are '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' and '__gnu_cxx::__normal_iterator<int*, std::vector<int> >')
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                |                                       |
      |                __normal_iterator<[...],[...]>          __normal_iterator<[...],[...]>
a.cc:9:44: note: candidate: 'operator&&(bool, bool)' (built-in)
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:9:44: note:   no known conversion for argument 2 from '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' to 'bool'
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166,
                 from a.cc:1:
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:9:82: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |                                                                                  ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:9:82: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |                                                                                  ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:9:82: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |                                                                                  ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:9:82: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |                                                                                  ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:9:82: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |                                                                                  ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const valarray<_Tp>&, const valarray<_Tp>&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:9:82: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::valarray<_Tp>'
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |                                                                                  ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:9:82: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::valarray<_Tp>'
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |                                                                                  ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:9:82: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::valarray<_Tp>'
    9 |   if (std::find(vec.begin(), vec.end(), 1) && std::find(vec.begin(), vec.end(), 9)&& std::find(vec.begin(), vec.end(), 7) && std::find(vec.begin(), vec.end(), 4) ){
      |                                                                                  ^