func_code_string: #include <bits/stdc++.h>   using namespace std;   int byk[3][3];   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int n;     cin >> n;     string s;     cin >> s;     for (int i = 0; i < n; i++) {       if (s[i] ==  B ) byk[i % 3][0]++;       if (s[i] ==  G ) byk[i % 3][1]++;       if (s[i] ==  R ) byk[i % 3][2]++;     }     int mini = 10000000;     vector<int> jwb;     vector<int> V;     V.push_back(0);     V.push_back(1);     V.push_back(2);     do {       int x = byk[0][0] + byk[0][1] + byk[0][2];       x -= byk[0][V[0]];       int y = byk[1][0] + byk[1][1] + byk[1][2];       y -= byk[1][V[1]];       int z = byk[2][0] + byk[2][1] + byk[2][2];       z -= byk[2][V[2]];       if (x + y + z < mini) {         mini = x + y + z;         jwb.clear();         jwb.push_back(V[0]);         jwb.push_back(V[1]);         jwb.push_back(V[2]);       }     } while (next_permutation(V.begin(), V.end()));     cout << mini << endl;     for (int i = 0; i < n; i++) {       if (i % 3 == 0) {         if (jwb[0] == 0) cout <<  B ;         if (jwb[0] == 1) cout <<  G ;         if (jwb[0] == 2) cout <<  R ;       }       if (i % 3 == 1) {         if (jwb[1] == 0) cout <<  B ;         if (jwb[1] == 1) cout <<  G ;         if (jwb[1] == 2) cout <<  R ;       }       if (i % 3 == 2) {         if (jwb[2] == 0) cout <<  B ;         if (jwb[2] == 1) cout <<  G ;         if (jwb[2] == 2) cout <<  R ;       }     }     cout << endl;     return 0;   }   