【leetcode】328 奇偶链表

pyy_lucy

于 2020-11-13 22:36:13 发布

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分类专栏： leetcode 文章标签： leetcode

本文链接：https://blog.youkuaiyun.com/qq_41889240/article/details/109683871

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方法一

时间复杂度O(N)
参照leetcode官方答案

/**
 * 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 oddEvenList(ListNode head) {
        if (head == null){
            return null;
        }
        ListNode odd = head;
        ListNode evenHead = head.next;
        ListNode even = evenHead;
        while (even != null && even.next != null){
            odd.next = odd.next.next;
            even.next = even.next.next;
            odd = odd.next;
            even = even.next;
        }
        odd.next = evenHead;
        return head;
    }
}