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c_cpp
2 months ago
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class Tweet {
public:
    int tweet_id;
    int user_id;
    int time;

    Tweet(int userId,int tweetId,int time): user_id(userId),tweet_id(tweetId),time(time){}
};

class User {
    public:
        int user_id;
        unordered_set<int> followees;
    
    User(int userId): user_id(userId){}
    void follow(int followeeId){
        followees.insert(followeeId);
    }

    void unfollow(int followeeId){
        followees.erase(followees.find(followeeId));
    }

    bool isFollowerOf(int followeeId){
        return followees.find(followeeId)!=followees.end();
    }
  
        
};


struct Comp{
    bool operator() (const Tweet &t1,const Tweet &t2){
return t1.time < t2.time;
    }
};

class Twitter {
public:

int time;
int selfId;
unordered_map<int,User> map;
priority_queue<Tweet,vector<Tweet>,Comp> q;
    Twitter() {
      time = 0;
      selfId = 0;  
    }
    
    void postTweet(int userId, int tweetId) {
    if (!selfId) 
        selfId = userId;

    if (map.find(selfId) == map.end()) {
        map.insert({selfId, User(selfId)});
    }

    Tweet t(userId, tweetId, time);
    time++;
    q.push(t);
}

    
    vector<int> getNewsFeed(int userId) {
        vector<int> tweets;
        queue<Tweet> q2;

      while(!q.empty() && tweets.size()!=10){
            Tweet t = q.top();
            q.pop();
            if (map.find(userId) != map.end() && (map.at(userId).isFollowerOf(t.user_id) || t.user_id == selfId)){
                tweets.push_back(t.tweet_id);
               }
            q2.push(t);
            
        }

        while(q2.empty()==false){
            q.push(q2.front());
            q2.pop();
        }
  
  

        return tweets;
    }
    
    void follow(int followerId, int followeeId) {
        if(map.find(followerId)==map.end()){
            User u(followerId);
            map.insert({followerId,u});
        }
        else{
                (*map.find(followerId)).second.follow(followeeId);
        }
      
    }
    
void unfollow(int followerId, int followeeId) {
    if(map.find(followerId)!=map.end()){
        (*map.find(followerId)).second.unfollow(followeeId);
    }
    
}
};
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