Language: C++

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

int main() {
	int x,y,z,n,a;
  	cin>>n;
  	x=y=z=a=0;
  	for (int i = 0; i < n; i++) {
      string s;
      cin >> s;
      int m = s.length();
      if (s[0]=='B' && s[m-1]=='A')
        z++;
      else if (s[0]=='B')
        x++;
      else if (s[m-1]=='A')
        y++;
      for (int j = 1; j < m; j++)
        if (s[j-1]=='A'&&s[j]=='B')
          a++;
    }
  	if (z) {
    	ans += z-1;
      	if (x) x--,a++;
      	if (y) y--,a++;
    }
  	cout << a + min(x,y) << endl;
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namspace'
    2 | using namspace std;
      |       ^~~~~~~~
a.cc: In function 'int main()':
a.cc:6:9: 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:9:7: error: 'string' was not declared in this scope
    9 |       string s;
      |       ^~~~~~
a.cc:9:7: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:10:14: error: 's' was not declared in this scope
   10 |       cin >> s;
      |              ^
a.cc:23:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   23 |         ans += z-1;
      |         ^~~
      |         abs
a.cc:27:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   27 |         cout << a + min(x,y) << 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:27:21: error: 'min' was not declared in this scope; did you mean 'std::min'?
   27 |         cout << a + min(x,y) << endl;
      |                     ^~~
      |                     std::min
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: 'std::min' declared here
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
a.cc:27:33: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   27 |         cout << a + min(x,y) << 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)
      |     ^~~~