Language: C++

#include <bits/stdc++.h>

int main() {
	ll n; cin >> n;
	string s; cin >> s;
	ll w = 0, b = 0;

	if (b == 1 && s[s.size() - 1] == '#') {
		cout << 0 << endl;
		return 0;
	}

	rep(i, 0, s.size()) {
		if (s[i] == '.')w++;
		if (s[i] == '#')b++;
	}
	cout << min(w, b) << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:9: error: 'll' was not declared in this scope
    4 |         ll n; cin >> n;
      |         ^~
a.cc:4:15: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 |         ll n; 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:4:22: error: 'n' was not declared in this scope; did you mean 'yn'?
    4 |         ll n; cin >> n;
      |                      ^
      |                      yn
a.cc:5:9: error: 'string' was not declared in this scope
    5 |         string s; cin >> s;
      |         ^~~~~~
a.cc:5:9: 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:5:26: error: 's' was not declared in this scope
    5 |         string s; cin >> s;
      |                          ^
a.cc:6:11: error: expected ';' before 'w'
    6 |         ll w = 0, b = 0;
      |           ^~
      |           ;
a.cc:8:13: error: 'b' was not declared in this scope
    8 |         if (b == 1 && s[s.size() - 1] == '#') {
      |             ^
a.cc:9:17: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    9 |                 cout << 0 << 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:9:30: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    9 |                 cout << 0 << 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:13:13: error: 'i' was not declared in this scope
   13 |         rep(i, 0, s.size()) {
      |             ^
a.cc:13:9: error: 'rep' was not declared in this scope
   13 |         rep(i, 0, s.size()) {
      |         ^~~
a.cc:17:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   17 |         cout << min(w, b) << 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: 'w' was not declared in this scope
   17 |         cout << min(w, b) << endl;
      |                     ^
a.cc:17:24: error: 'b' was not declared in this scope
   17 |         cout << min(w, b) << endl;
      |                        ^
a.cc:17:17: error: 'min' was not declared in this scope; did you mean 'std::min'?
   17 |         cout << min(w, b) << 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:17:30: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   17 |         cout << min(w, b) << endl;
      |                              ^~~~
      |                              std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~