[leetcode]143. Reorder List重排链表

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[leetcode]143. Reorder List重排链表

Given a singly linked list L: L0→L1→…→Ln-1→Ln,reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→… You may not modify the values in the list's nodes, only nodes itself may be changed. 思路: 1. find mid 2. cut list 3. reverse slow part 4. merge two parts 代码: clas…

143 Reorder List 重排链表

给定一个单链表L:L0→L1→…→Ln-1→Ln,重新排列后为: L0→Ln→L1→Ln-1→L2→Ln-2→…必须在不改变节点的值的情况下进行原地操作.例如,给定链表 {1,2,3,4},按要求重排后为 {1,4,2,3}.详见:https://leetcode.com/problems/reorder-list/description/ Java实现: 1.使用快慢指针来找到链表的中点,并将链表从中点处断开,形成两个独立的链表:2.将第二个链翻转:3.将第二个链表的元素间隔地插入第一个链表中…

leetcode 143. Reorder List 、86. Partition List

143. Reorder List https://www.cnblogs.com/grandyang/p/4254860.html 先将list的前半段和后半段分开,然后后半段进行逆序,然后再连接 class Solution { public: void reorderList(ListNode* head) { if(head == NULL) return; ListNode* p1 = head; ListNode* p2 = head; while(p2->next != NULL…

[Leetcode] Reorder list 重排链表

Given a singly linked list L: L 0→L 1→…→L n-1→L n,reorder it to: L 0→L n →L 1→L n-1→L 2→L n-2→… You must do this in-place without altering the nodes' values. For example,Given{1,2,3,4}, reorder it to{1,4,2,3}. 反转以后的链表是,从左往右是,node0->noden->node1->…

leetcode 143. Reorder List ----- java

Given a singly linked list L: L0→L1→-→Ln-1→Ln,reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→- You must do this in-place without altering the nodes' values. For example,Given {1,2,3,4}, reorder it to {1,4,2,3}. 按照题意改变链表结构. 1.使用list记录链表. /** * Definition for si…

Leetcode 143. Reorder List（Medium）

Given a singly linked list L: L0→L1→…→Ln-1→Ln,reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→… You must do this in-place without altering the nodes' values. For example,Given {1,2,3,4}, reorder it to {1,4,2,3}. 搞了一天多,纠结到一个while 写成了if........... 思路很清晰, 找出链表的中点…

Java for LeetCode 143 Reorder List

Given a singly linked list L: L0→L1→…→Ln-1→Ln, reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→… You must do this in-place without altering the nodes' values. For example, Given {1,2,3,4}, reorder it to {1,4,2,3}. 解题思路一: 每次将Ln换到前面,得到L0→Ln→L1→L2→L3→,然后对L1使用相同操作,…