Create 1207 unique number of occurrences.cpp

Author: Meghak1

1207 unique number of occurrences.cpp

@@ -0,0 +1,18 @@
+class Solution {
+public:
+    bool uniqueOccurrences(vector<int>& arr) {
+    unordered_map<int,int> count;
+    unordered_set<int> occurrence_unique;
+
+    for (int num:arr) {
+            count[num]++;
+        }
+
+    for (const auto& pair:count) {
+         if (!occurrence_unique.insert(pair.second).second)    {
+                return false;
+        }
+      }
+return true;
+   }
+};