Create 1207. Unique Number of Occurrences.java

Author: rising0raj

1207. Unique Number of Occurrences.java

@@ -0,0 +1,23 @@
+// Runtime    2ms
+// Beats      98.10%
+
+// Memory     41.69MB
+// Beats      28.27%
+
+
+class Solution {
+    public boolean uniqueOccurrences(int[] arr) {
+        HashMap<Integer,Integer> map=new HashMap<>();
+        HashMap<Integer,Integer> res=new HashMap<>();
+        for(int i=0;i<arr.length;i++){
+            map.put(arr[i],map.getOrDefault(arr[i],0)+1);
+        }
+        for(Map.Entry<Integer,Integer> ent:map.entrySet()){
+            if(res.containsKey(ent.getValue())){
+                return false;
+            }
+            res.put(ent.getValue(),0);
+        }
+        return true;
+    }
+}