diff --git a/Top150Interview/380InsertDeleteGetRandomO1.py b/Top150Interview/380InsertDeleteGetRandomO1.py
index 531aea9..ea435cb 100644
--- a/Top150Interview/380InsertDeleteGetRandomO1.py
+++ b/Top150Interview/380InsertDeleteGetRandomO1.py
@@ -1,26 +1,36 @@
+import random as r
+
 def __init__(self):
-    
+    self.set = {}
 
 def insert(self, val):
     """
     :type val: int
     :rtype: bool
     """
-    return True
+    if val is None:
+        return None
+    if val not in self:
+        self.add(val)
+        return True
+    return False
 
 def remove(self, val):
     """
     :type val: int
     :rtype: bool
     """
-    return False
+    if val not in self:
+        return False
+    self.discard(val)
+    return True
     
 
 def getRandom(self):
     """
     :rtype: int
     """
-    return getRandom
+    return r.self