题解 | #Red and Blue and Green#

直接随机乱搞就好了

#include<bits/stdc++.h>
using namespace std;
char a[100005];
char m[3]={'G','R','B'};
int main()
{
    int n;
    cin>>n;
    for(int i =1;i<=n;i++)
    {
        cin>>a[i];
        while(a[i-1]==a[i])
            a[i]=m[rand()%3];
    }
    for(int i=1;i<=n;i++)
        cout<<a[i];
    return 0;
}