83 LeetCode Java: Remove Duplicates from Sorted List – Easy¶

Problem:¶

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3.

Thoughts:¶

Using fakeHead to make list manipulation easier.

Solutions:¶

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        if (head == null || head.next == null) {
            return head;
        }
        ListNode p = head;
        while (p.next != null) {
            if (p.val == p.next.val) {
                p.next = p.next.next;
            }
            else {
                p = p.next;
            }
        }
        return head;
    }
}