func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 100010;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n = 0;     string s;     long long int res = 0ll;     cin >> n;     cin >> s;     res = (1ll * n * (n + 1)) / 2ll - 1ll * n;     for (int i = 0; i + 1 < n; ++i) {       if (s[i] != s[i + 1]) {         int j;         for (j = i + 1; j < n; ++j) {           if (s[i] == s[j]) break;         }         res -= (j - i - 1);       }     }     reverse(s.begin(), s.end());     for (int i = 0; i + 1 < n; ++i) {       if (s[i] != s[i + 1]) {         int j;         for (j = i + 1; j < n; ++j) {           if (s[i] == s[j]) break;         }         res -= (j - i - 2);       }     }     cout << res;   }   