Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string s;cin>>s;
  vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
  int n=0;
  for(int i=0;i<16;i++){
    if(s.at(i)!=a.at(i))n++;
  }
  cout<<n<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:18: error: 'C' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                  ^
a.cc:5:20: error: 'O' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                    ^
a.cc:5:22: error: 'D' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                      ^
a.cc:5:24: error: 'E' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                        ^
a.cc:5:26: error: 'F' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                          ^
a.cc:5:30: error: 'S' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                              ^
a.cc:5:32: error: 'T' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                                ^
a.cc:5:34: error: 'I' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                                  ^
a.cc:5:36: error: 'V' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                                    ^
a.cc:5:38: error: 'A' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                                      ^
a.cc:5:40: error: 'L' was not declared in this scope
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                                        ^
a.cc:5:49: error: no matching function for call to 'std::vector<char>::vector(<brace-enclosed initializer list>)'
    5 |   vector<char> a{C,O,D,E,F,E,S,T,I,V,A,L,2,0,1,6};
      |                                                 ^
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:707:9: note: candidate: 'template<class _InputIterator, class> std::vector<_Tp, _Alloc>::vector(_InputIterator, _InputIterator, const allocator_type&) [with <template-parameter-2-2> = _InputIterator; _Tp = char; _Alloc = std::allocator<char>]'
  707 |         vector(_InputIterator __first, _InputIterator __last,
      |         ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:707:9: note:   candidate expects 3 arguments, 16 provided
/usr/include/c++/14/bits/stl_vector.h:678:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>]'
  678 |       vector(initializer_list<value_type> __l,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:678:7: note:   candidate expects 2 arguments, 16 provided
/usr/include/c++/14/bits/stl_vector.h:659:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, std::__type_identity_t<_Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>; std::__type_identity_t<_Alloc> = std::allocator<char>]'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:659:7: note:   candidate expects 2 arguments, 16 provided
/usr/include/c++/14/bits/stl_vector.h:640:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::false_type) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>; std::false_type = std::false_type]'
  640 |       vector(vector&& __rv, const allocator_type& __m, false_type)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note:   candidate expects 3 arguments, 16 provided
/usr/include/c++/14/bits/stl_vector.h:635:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::true_type) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>; std::true_type = std::true_type]'
  635 |       vector(vector&& __rv, const allocator_type& __m, true_type) noexcept
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:635:7: note:   candidate expects 3 arguments, 16 provided
/usr/include/c++/14/bits/stl_vector.h:624:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&, std::__type_identity_t<_Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>; std::__type_identity_t<_Alloc> = std::allocator<char>]'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:624:7: note:   candidate expects 2 arguments, 16 provided
/usr/include/c++/14/bits/stl_vector.h:620:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = char; _Alloc = std::allocator<char>]'
  620 |       vector(vector&&) noexcept = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note:   candidate expects 1 argument, 16 provided
/usr/include/c++/14/bits/stl_vector.h:601:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>]'
  601 |       vector(const vector& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:601:7: note:   candidate expects 1 argument, 16 provided
/usr/include/c++/14/bits/stl_vector.h:569:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const value_type&, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; size_type = long unsigned int; value_type = char; allocator_type = std::allocator<char>]'
  569 |       vector(size_type __n, const value_type& __value,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:569:7: note:   candidate expects 3 arguments, 16 provided
/usr/include/c++/14/bits/stl_vector.h:556:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; size_type = long unsigned int; allocator_type = std::allocator<char>]'
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:7: note:   candidate expects 2 arguments, 16 provided
/usr/include/c++/14/bits/stl_vector.h:542:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>]'
  542 |       vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note:   candidate expects 1 argument, 16 provided
/usr/include/c++/14/bits/stl_vector.h:531:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector() [with _Tp = char; _Alloc = std::allocator<char>]'
  531 |       vector() = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:531:7: note:   candidate expects 0 arguments, 16 provided