func_code_string: #include <bits/stdc++.h>   using namespace std;   const int oo = 2e9;   const int N = 1e6;   int n;   string s, x =  BGR ;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     ;     cin >> n >> s;     int k = oo;     string ans;     do {       int cnt = 0;       string t = s;       for (int i = 0; i < n; i++)         if (t[i] != x[i % 3]) {           cnt++;           t[i] = x[i % 3];         }       if (cnt < k) {         k = cnt;         ans = t;       }     } while (next_permutation(x.begin(), x.end()));     cout << k <<   n  << ans;   }   