LeetCode115|删除排序链表中的重复元素

示例 1:

输入: 1->1->2
输出: 1->2
示例 2:

输入: 1->1->2->3->3
输出: 1->2->3

public class DeleteDuplicatesTest {
    public static void main(String[] args) {
        ListNode l1 = new ListNode(1);
        ListNode l2 = new ListNode(1);
        ListNode l3 = new ListNode(2);
        l1.next = l2;
        l2.next = l3;
        ListNode listNode = deleteDuplicates(l1);
        System.out.println("listNode = " + listNode);

    }

    public static ListNode deleteDuplicates(ListNode head) {
        if (head == null) {
            return null;
        }
        if (head.next == null) {
            return head;
        }
        ListNode tempNode = head;
        while (tempNode.next != null) {
            if (tempNode.val == tempNode.next.val) {
                tempNode.next = tempNode.next.next;
            } else {
                tempNode = tempNode.next;
            }
        }
        return head;
    }
}