Language: C++

#include <bits/stdc++.h>
using namespce std;

int main() {
  int n, cout;
  cin >> n;
  cout = 0;
  
  vector<int> p(n);
  vector<int> p_s(n);
  for(int i=0; i<n; i++) {
    cin >> p.at(i);
    p_s.at(i) = p.at(i);
  }
  
  sort(p_s.begin(), p_s.end());
  for (int i=0; i<n; i++) {
  	if (p.at(i)!=p_s.at(i)) {
    	cout++;
    }
  }
  
  if (cout==2) {
  	cout << "YES" << endl;
    return 0;
  }
  
  cout << "NO" << endl;
  return 0;
  
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namespce'
    2 | using namespce std;
      |       ^~~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> n;
      |   ^~~
      |   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:9:3: error: 'vector' was not declared in this scope
    9 |   vector<int> p(n);
      |   ^~~~~~
a.cc:9:3: 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:9:10: error: expected primary-expression before 'int'
    9 |   vector<int> p(n);
      |          ^~~
a.cc:10:10: error: expected primary-expression before 'int'
   10 |   vector<int> p_s(n);
      |          ^~~
a.cc:12:12: error: 'p' was not declared in this scope
   12 |     cin >> p.at(i);
      |            ^
a.cc:13:5: error: 'p_s' was not declared in this scope
   13 |     p_s.at(i) = p.at(i);
      |     ^~~
a.cc:16:8: error: 'p_s' was not declared in this scope
   16 |   sort(p_s.begin(), p_s.end());
      |        ^~~
a.cc:16:3: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   16 |   sort(p_s.begin(), p_s.end());
      |   ^~~~
      |   std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:18:13: error: 'p' was not declared in this scope
   18 |         if (p.at(i)!=p_s.at(i)) {
      |             ^
a.cc:24:14: error: invalid operands of types 'int' and 'const char [4]' to binary 'operator<<'
   24 |         cout << "YES" << endl;
      |         ~~~~ ^~ ~~~~~
      |         |       |
      |         int     const char [4]
a.cc:24:26: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   24 |         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:28:8: error: invalid operands of types 'int' and 'const char [3]' to binary 'operator<<'
   28 |   cout << "NO" << endl;
      |   ~~~~ ^~ ~~~~
      |   |       |
      |   int     const char [3]
a.cc:28:19: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   28 |   cout << "NO" << endl;
      |                   ^~~~
      |                   std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~