func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n, count = 0, ans;     cin >> n;     string s;     cin >> s;     long long r = 0, b = 0;     for (long long i = 0; i < n; i++)       if (s[i] ==  r )         r++;       else if (s[i] ==  b )         b++;     for (long long i = 0; i < n; i++)       if (i % 2 == 0 && s[i] !=  r )         count++;       else if (i % 2 == 1 && s[i] !=  b )         count++;     long long rx = n % 2 == 1 ? 1 + (long long)(n / 2) : n / 2;     ans = abs(r - rx);     count -= ans;     ans += (count / 2);     count = 0;     for (long long i = 0; i < n; i++)       if (i % 2 == 1 && s[i] !=  r )         count++;       else if (i % 2 == 0 && s[i] !=  b )         count++;     ans = min(ans, abs(b - rx) + (count - abs(b - rx)) / 2);     cout << ans;   }   