func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     string a;     cin >> a;     int count1 = 0, count2 = 0, count3 = 0, count4 = 0;     for (int i = 0; i < a.length(); i++) {       if (a[i] ==  r  && i % 2 == 0) count1++;       if (a[i] ==  b  && i % 2 == 0) count3++;       if (a[i] ==  b  && i % 2 != 0) count2++;       if (a[i] ==  r  && i % 2 != 0) count4++;     }     cout << min(max(count1, count2), max(count3, count4)) << endl;   }   