Create finding-the-users-active-minutes.cpp

Author: kamyu104

C++/finding-the-users-active-minutes.cpp

@@ -0,0 +1,17 @@
+// Time:  O(n)
+// Space: O(n)
+
+class Solution {
+public:
+    vector<int> findingUsersActiveMinutes(vector<vector<int>>& logs, int k) {
+        unordered_map<int, unordered_set<int>> lookup;
+        for (const auto& log : logs) {
+            lookup[log[0]].emplace(log[1]);
+        }
+        vector<int> result(k);
+        for (const auto& [_, ts] : lookup) {
+            ++result[size(ts) - 1];
+        }
+        return result;
+    }
+};