2456. Most Popular Video Creator

You are given two string arrays creators and ids, and an integer array views, all of length n. The ith video on a platform was created by creator[i], has an id of ids[i], and has views[i] views.

The popularity of a creator is the sum of the number of views on all of the creator’s videos. Find the creator with the highest popularity and the id of their most viewed video.

• If multiple creators have the highest popularity, find all of them.
• If multiple videos have the highest view count for a creator, find the lexicographically smallest id.

Return a 2D array of strings answer where answer[i] = [creatori, idi] means that creatori has the highest popularity and idi is the id of their most popular video. The answer can be returned in any order.

class Solution {
public:
    vector<vector<string>> mostPopularCreator(vector<string>& creators, vector<string>& ids, vector<int>& views) {
        unordered_map<string, long long> freq;
        unordered_map<string, string> name;
        unordered_map<string, long long> view;
        long long ma = -1;
        for(int i = 0; i < creators.size(); i++) {
            string c = creators[i];
            string id = ids[i];
            long long v = views[i];
            if(!name.count(c)) name[c] = id;
            if(view[c] == v) {
                name[c] = min(name[c], id);

            } else if(view[c] < v) {
                name[c] = id;
            }
            view[c] = max(view[c], v);
            freq[c] += v;
            ma = max(ma, freq[c]);
        }
        vector<vector<string>> res;
        for(auto [k,v] : freq) {
            if(v == ma) {
                res.push_back({k,name[k]});
            }
        }
        return res;
    }
};