很自然的推广,假设去掉全然二叉树的条件呢?由于这个条件不是关键,因此不会影响整体的思路.做法依旧是每次找到一层的起点,然后一层一层的走. 假设是全然二叉树的话,每层的起点就是上一层起点的左孩子,兄弟之间的链接也简单,直接找相应父亲的左右孩子就可以. 一般二叉树时,起点应该是上一层第一个有孩子节点的左孩子,或者没有左孩子时.是他的右孩子. 为了能在孩子层中不断链接,我们必须保存当孩子层的前一个节点,当当前层找到一个节点有孩子,就接到这个pre节点后面,然后更新pre节点的指向. class Sol…

[LeetCode]117. Populating Next Right Pointers in Each Node II 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/populating-next-right-pointers-in-each-node-ii/description/ 题目描述: Follow up for problem "Populating Next Right Pointers in Each…

题目链接:Populating Next Right Pointers in Each Node II | LeetCode OJ Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution still work? Note: You may only u…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution still…

Populating Next Right Pointers in Each Node II Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution still work? Note: You may only use constant extra s…

Problem Link: http://oj.leetcode.com/problems/populating-next-right-pointers-in-each-node-ii/ OK... Exactly same to Populating Next Right Pointers in Each Node.…

Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution still work? Note: You may only use constant extra space. For example,Given the following binary tr…

这道题尽管是上一道题的增强.可是反而简单了. 能够交易无数次,可是买卖必须成对的出现. 为了简单起见.我用abc三股股票来说明,且忽略掉相等的情况.三个数一共同拥有六种大小关系.注意他们之间的先后顺序是不能乱的. 1. a<b<c. 这样的情况下的最大收益是c-a,c-a=(c-b)+(b-a).连续的大于,依次算差.加起来即可了. 2. b<a<c. 即中间那股小,最大收益是c-b.由于a入b出赔钱,a入c出收益少. 3. a<c<b. 最大收益b-a. 4. b&l…

题目 Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; } Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to NULL. Initially,…

题目链接:Populating Next Right Pointers in Each Node | LeetCode OJ Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; } Populate each next pointer to point to its next right node. If there is no next ri…