Function good

String Algorithms/Required Substring.cpp:23–29

}

bool good(vector<char> pre, int k){
    int SZ = (int) pre.size();
    for(int i = 0; i < SZ-k; i++)
        if(pre[i+k] != S[i])
            return false;
    return true;
}

int main(){
    scanf("%d %s", &N, S);