func_code_string: #include <bits/stdc++.h>   using namespace std;   int32_t main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long n;     cin >> n;     string s;     cin >> s;     long long ans = (n * (n - 1)) / 2;     long long l = 0, r = n - 1;     while (s[l] == s[0]) l++;     while (s[r] == s[n - 1]) r--;     r = n - 1 - r;     long long num = 0;     for (long long i = 1; i < n; i++) {       if (s[i] != s[i - 1]) {         num++;       }     }     cout << ans - (2 * n) + l + r + num;     return 0;   }   