Remove Duplicates from Sorted List

83. Remove Duplicates from Sorted List
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]

class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        if(head==null ||head.next==null)
        {
            return head;
        }
        ListNode temp=head;
        while(temp!=null && temp.next!=null){
            if(temp.val==temp.next.val)
            {
                temp.next=temp.next.next;
            }
            else
            {
                temp=temp.next;
            }
        }
        return head;
    }
}