class Solution {
public:
    /**
     * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
     *
     * 
     * @param ID int整型vector 
     * @param content string字符串vector 
     * @param word string字符串 
     * @return int整型vector
     */
    vector<int> invertedIndex(vector<int>& ID, vector<string>& content, string word) {
        vector<int> res{};
        int n = ID.size();
        for (int i = 0; i < n; i++) {
            if (content[i].find(word) != string::npos) {
               res.push_back(ID[i]); 
            }
        }
        return res;
    }
};