Remove Duplicates from Sorted List LeetCode Solution | Easy Approach

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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 ListSolutions

Time: O(n)
Space: O(1)

C++

class Solution {
 public:
  ListNode* deleteDuplicates(ListNode* head) {
    ListNode* curr = head;

    while (curr) {
      while (curr->next && curr->val == curr->next->val)
        curr->next = curr->next->next;
      curr = curr->next;
    }

    return head;
  }
};

Java

 
class Solution {
  public ListNode deleteDuplicates(ListNode head) {
    ListNode curr = head;

    while (curr != null) {
      while (curr.next != null && curr.val == curr.next.val)
        curr.next = curr.next.next;
      curr = curr.next;
    }

    return head;
  }
}

Python

  Will be updated Soon
class Solution:
  def deleteDuplicates(self, head: ListNode) -> ListNode:
    curr = head

    while curr:
      while curr.next and curr.val == curr.next.val:
        curr.next = curr.next.next
      curr = curr.next

    return head
  Will be updated Soon

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