LeetCode - Remove Duplicates from Sorted List | Darren's Blog


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.
public ListNode deleteDuplicates(ListNode head) {
        if (head == null || head.next == null)  // No node or only a single node
            return head;
 
        ListNode previous = head, current = head.next;
 
        // Remove the current node if its value is the same with its previous node
        while (current != null) {
            if (current.val == previous.val) {  // Duplicates found
                previous.next = current.next;
                current = current.next;
            } else {    // Move to the next node
                previous = current;
                current = current.next;
            }
        }
 
        return head;
    }
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