LeetCode-83:删除排序链表中的重复元素(Java语言实现)

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

    }
}

这个是递归版本，前一个是快慢指针版本