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) {
        if(head == null || head.next == null)return head;
        head.next = deleteDuplicates(head.next);
        return head.val == head.next.val ? head.next : head;
}

Remove Duplicates from Sorted List LeetCode Solution in Python

def deleteDuplicates(self, head):
    cur = 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
    return head

Remove Duplicates from Sorted List LeetCode Solution in C++

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