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【原创】leetCodeOj ---Remove Duplicates from Sorted List II 解题报告

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原题地址:

https://oj.leetcode.com/problems/remove-duplicates-from-sorted-list-ii/

 

题目内容:

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.

For example,
Given 1->2->3->3->4->4->5, return 1->2->5.
Given 1->1->1->2->3, return 2->3.

 

方法:

递归做非常直观。

判断当前节点的值是否等于下一个节点的值,若不等,直接递归调用下一个节点;

若相等,则找到下一个不和当前节点相等的节点,并将其更新为当前节点,同时递归调用该节点。

 

全部代码:

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

 

【原创】leetCodeOj ---Remove Duplicates from Sorted List II 解题报告