1817

class Solution {
public:
    vector<int> findingUsersActiveMinutes(vector<vector<int>>& logs, int k) {
        unordered_map<int, set<int>> m;
        for(int i=0; i<logs.size(); i++){
            m[logs[i][0]].insert(logs[i][1]);
        }
        vector<int> ans(k, 0);
        for(auto s: m){
            int sz = s.second.size();
            ans[sz-1]++;
        }
        return ans;
    }
};