Language: C++

#include<bits/stdc++.h>
2 using namespace std;
int main() {
int A;
 cin >> A;
vector<int> B(A);
for(int i = 0;i < A;i++){
cin >> A[i];
}
 int count = 0;
for(int i = 0;i < (int)n;i++){
  if(A[i] != i + 1){
    k++;
  }
}
 if(count <= 2){
   cout << "YES" << endl;
 }
 if(count > 2){
   cout << "NO"
 }

Compiler output:
a.cc:2:1: error: expected unqualified-id before numeric constant
    2 | 2 using namespace std;
      | ^
a.cc: In function 'int main()':
a.cc:5:2: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |  cin >> A;
      |  ^~~
      |  std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:1: error: 'vector' was not declared in this scope
    6 | vector<int> B(A);
      | ^~~~~~
a.cc:6:1: 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:
/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:6:8: error: expected primary-expression before 'int'
    6 | vector<int> B(A);
      |        ^~~
a.cc:8:9: error: invalid types 'int[int]' for array subscript
    8 | cin >> A[i];
      |         ^
a.cc:11:24: error: 'n' was not declared in this scope
   11 | for(int i = 0;i < (int)n;i++){
      |                        ^
a.cc:12:7: error: invalid types 'int[int]' for array subscript
   12 |   if(A[i] != i + 1){
      |       ^
a.cc:13:5: error: 'k' was not declared in this scope
   13 |     k++;
      |     ^
a.cc:17:4: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   17 |    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:17:21: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   17 |    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:20:4: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   20 |    cout << "NO"
      |    ^~~~
      |    std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:21:3: error: expected '}' at end of input
   21 |  }
      |   ^
a.cc:3:12: note: to match this '{'
    3 | int main() {
      |            ^