Hotel Reviews

• Time : $O(|A| + |B_i|)$
• Space : $O(|A|)$

void modify(string& s) {
    for(int i = 0; i < s.length(); i++) if(s[i] == '_') s[i] = ' ';
}

vector<int> Solution::solve(string A, vector<string> &B) {
    modify(A);
    stringstream ss;
    string now;
    ss<<A;
    unordered_set<string> good;
    while(ss>>now) good.insert(now);
    vector<pair<int, int>> S;
    for(int i = 0; i < B.size(); i++) {
        modify(B[i]);
        ss.clear();
        ss<<B[i];
        int score = 0;
        while(ss>>now) if(good.count(now)) score += 1;
        S.push_back({score,i});
    }
    sort(begin(S), end(S), [](auto a, auto b) {
        if(a.first == b.first) return a.second < b.second;
        return a.first > b.first;
    });
    vector<int> res;
    for(auto [_, idx] : S) res.push_back(idx);
    return res;
}