Language: C++

#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define repr(i, n) for(int i = ((int)(n) - 1); i >= 0; i--)
#define repn(i, n) for(int i = 1; i <= (int)(n); i++)
#define reprn(i, n) for(int i = ((int)(n)); i > 0; i--)
#define all(x) (x).begin(), (x).end()
using llint = long long int;
using lint = long int;

#include <iostream>
#include <array>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
using namespace std;

int main() {
	int n;
	string s;
	cin >> n >> s;
	if (s.find(".") == string::npos) {
		cout << 0 << endl;
		return 0;
	}
	if (s.find("#") == string::npos) {
		cout << 0 << endl;
		return 0;
	}
	int ans = 100000;
	rep(i, s.length()) {
		ans = min(ans, count(s.cbegin() + i, s.cend(), '.') + count(s.cbegin(), s.cbegin() + i, '#'));
	}
	cout << ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:26: error: no matching function for call to 'min(int&, std::__iterator_traits<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >, void>::difference_type)'
   31 |                 ans = min(ans, count(s.cbegin() + i, s.cend(), '.') + count(s.cbegin(), s.cbegin() + i, '#'));
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:9:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:31:26: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::__iterator_traits<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >, void>::difference_type' {aka 'long int'})
   31 |                 ans = min(ans, count(s.cbegin() + i, s.cend(), '.') + count(s.cbegin(), s.cbegin() + i, '#'));
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:12:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:31:26: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   31 |                 ans = min(ans, count(s.cbegin() + i, s.cend(), '.') + count(s.cbegin(), s.cbegin() + i, '#'));
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~