Language: C++

#include<iostream>
#include<string>
#include<math.h>
#include<algorithm>
#include<vector>
#include<iomanip>
#include<map>
#include<numeric>
#include<queue>
#define rep(i,n) for(int i=0;i<n;++i)
#define yes cout<<"Yes"<<endl
#define no cout<<"No"<<endl
#define mod 1000000007
using namespace std;
using ll = long long;
using p_i = pair<int, int>;
int main() {
	int N, num; cin >> N;
	vector<char> S(N);
	rep(i, N) cin >> S[i];
	int ans = count(S.begin() + 1, S.end(), 'W');
	for (int i = 0; i < N; ++i) {
		num = count(S.begin(), S.begin() + i, 'W') + count(S.begin() + i + 1, S.end(), 'E');
		ans = min(ans, count(S.begin(), S.begin() + i, 'W') + count(S.begin() + i + 1, S.end(), 'E'));
	}
	cout << ans << endl;
	cin >> N;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:26: error: no matching function for call to 'min(int&, std::__iterator_traits<__gnu_cxx::__normal_iterator<char*, std::vector<char> >, void>::difference_type)'
   24 |                 ans = min(ans, count(S.begin(), S.begin() + i, 'W') + count(S.begin() + i + 1, S.end(), 'E'));
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:1:
/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:24:26: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::__iterator_traits<__gnu_cxx::__normal_iterator<char*, std::vector<char> >, void>::difference_type' {aka 'long int'})
   24 |                 ans = min(ans, count(S.begin(), S.begin() + i, 'W') + count(S.begin() + i + 1, S.end(), 'E'));
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:4:
/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:24:26: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   24 |                 ans = min(ans, count(S.begin(), S.begin() + i, 'W') + count(S.begin() + i + 1, S.end(), 'E'));
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~