Language: C++

#include <bits/stdc++.h>
int main(){
    vector<int> vec(3);
    
    int five_count=0;
    int seven_count=0;
    
    for(int i=0; i<3; ++i){
        cin >> vec.at(i);
    }
    
    for(int i=0; i<3; ++i){
        if(vec.at(i)==5){
            ++five_count;
        }else if(vec.at(i)==7){
            ++seven_count;
        }else continue;
    }
    
    if((five_count==2) && (seven_count==1)){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:5: error: 'vector' was not declared in this scope
    3 |     vector<int> vec(3);
      |     ^~~~~~
a.cc:3:5: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:3:12: error: expected primary-expression before 'int'
    3 |     vector<int> vec(3);
      |            ^~~
a.cc:9:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    9 |         cin >> vec.at(i);
      |         ^~~
      |         std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:9:16: error: 'vec' was not declared in this scope
    9 |         cin >> vec.at(i);
      |                ^~~
a.cc:13:12: error: 'vec' was not declared in this scope
   13 |         if(vec.at(i)==5){
      |            ^~~
a.cc:21:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   21 |         cout << "Yes" << endl;
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:21:26: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   21 |         cout << "Yes" << endl;
      |                          ^~~~
      |                          std::endl
In file included from /usr/include/c++/14/istream:41,
                 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/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:23:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   23 |         cout << "No" << endl;
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:23:25: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   23 |         cout << "No" << endl;
      |                         ^~~~
      |                         std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~