func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     stack<char> s;     int n, count = 0;     char c;     cin >> n;     for (int i = 0; i < n; i++) {       cin >> c;       if (s.empty())         s.push(c);       else if (s.top() == c) {         s.pop();         s.push(c);         count++;       } else         s.push(c);     }     cout << count << endl;     return 0;   }   