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# Remove Duplicates from Sorted List LeetCode Solution

## Problem – Remove Duplicates from Sorted List LeetCode Solution

Given the `head` of a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well.

Example 1:

``````Input: head = [1,1,2]
Output: [1,2]
``````

Example 2:

``````Input: head = [1,1,2,3,3]
Output: [1,2,3]
``````

Constraints:

• The number of nodes in the list is in the range `[0, 300]`.
• `-100 <= Node.val <= 100`
• The list is guaranteed to be sorted in ascending order.

### Remove Duplicates from Sorted List LeetCode Solution in Java

``````public ListNode deleteDuplicates(ListNode head) {
}
``````

### Remove Duplicates from Sorted List LeetCode Solution in Python

``````def deleteDuplicates(self, head):
while cur:
while cur.next and cur.next.val == cur.val:
cur.next = cur.next.next     # skip duplicated node
cur = cur.next     # not duplicate of current node, move to next node
``````

### Remove Duplicates from Sorted List LeetCode Solution in C++

``````ListNode* deleteDuplicates(ListNode* head) {
while(cur) {
while(cur->next && cur->val == cur->next->val) {
cur->next = cur->next->next;
}
cur = cur->next;
}
}
``````
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