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LeetCode solutions

2543. Most Popular Video Creator

My accepted C++ solution to LeetCode problem 2543, Most Popular Video Creator, running in 123ms.

  • Difficulty: Medium
  • C++
  • Runtime 123ms
  • Memory 134MB

Read the problem on LeetCode View on GitHub

The problem statement is LeetCode’s and stays on their site. What follows is my accepted solution.

C++

Accepted on LeetCode — runtime 123ms, memory 134MB, accepted 2025-12-27.

cpp
class Solution {
    public:
    vector<vector<string>> mostPopularCreator(vector<string>& creators, vector<string>& ids, vector<int>& views) {
        unordered_map<string, long long> popularity;
        unordered_map<string, pair<int, string>> bestVideo;
        int n = creators.size();
        long long maxPop = 0;
        for (int i = 0; i < n; i++) {
            popularity[creators[i]] += views[i];
            maxPop = max(maxPop, popularity[creators[i]]);
            if (bestVideo.find(creators[i]) == bestVideo.end() ||
            views[i] > bestVideo[creators[i]].first ||
            (views[i] == bestVideo[creators[i]].first && ids[i] < bestVideo[creators[i]].second)) {
                bestVideo[creators[i]] = {views[i], ids[i]};
            }
        }
        vector<vector<string>> result;
        for (auto& p : popularity) {
            if (p.second == maxPop) {
                result.push_back({p.first, bestVideo[p.first].second});
            }
        }
        return result;
    }
};

Source