A. Codeforces Checking（打表枚举）

#include <iostream>
using namespace std;
int main(){
    int n;
    cin >> n;
    string s;
    bool flag;
    string ss= "codeforces";
    for(int i = 0;i < n;i++){
        cin >> s;
        flag = false;
        for(int j = 0;j < 10;j++)
            if(s[0] == ss[j]) flag = true;//cout << s[0] << s[j] << endl;}
        if(flag) cout << "Yes" << endl;
        else cout << "No" << endl;
    }
    return 0;
}