Remove Duplicates from Sorted List Leetcode Solution

In this post, we are going to solve the Remove Duplicates from Sorted List Leetcode Solution problem of Leetcode. This Leetcode problem is done in many programming languages like C++, Java, and Python.

Table of Contents

Problem

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.

Now, let’s see the leetcode solution of Remove Duplicates from Sorted List Leetcode Solution.

Remove Duplicates from Sorted List Leetcode Solution in Python

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

Remove Duplicates from Sorted List Leetcode Solution in CPP

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;
  }
};

Remove Duplicates from Sorted List Leetcode Solution in 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;
  }
}

Note: This problem Remove Duplicates from Sorted List is generated by Leetcode but the solution is provided by Chase2learn This tutorial is only for Educational and Learning purposes.

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