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+# 0082. Remove Duplicates from Sorted List II
+
+* Difficulty: medium
+* Link: https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/
+* Topics: Linked-List, Multiple-Pointers
+
+# Clarification
+
+1. Check the inputs and outputs
+    - INPUT: Linked List
+    - OUTPUT: Linked List
+
+# Naive Solution
+
+### Thought Process
+
+- current pointer and previous pointer
+1. iterate the linked list
+    - if current.val == current.next.val: prev.next=current.next
+    - else
+        - previous = previous.next
+    - current = current.next
+    
+    ![Untitled](./Untitled.png)
+    
+- Implement
+    
+    ```python
+    **# Definition for singly-linked list.
+    # class ListNode:
+    #     def __init__(self, val=0, next=None):
+    #         self.val = val
+    #         self.next = next
+    
+    class Solution: 
+        def deleteDuplicates(self, head: ListNode) -> ListNode:
+            dummy = ListNode(0, head)
+            prev = dummy
+            current = dummy.next
+            while current:
+                if current.next and current.val == current.next.val:
+                    while current.next and current.val == current.next.val:
+                        current = current.next
+                    prev.next = current.next
+                else:
+                    prev = prev.next
+                current = current.next
+            return dummy.next**
+    ```
+    
+
+### Complexity
+
+- Time complexity:$O(n)$
+- Space complexity:$O(1)$
+
+### Problems & Improvement
+
+-
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