首页 > 代码库 > Populating Next Right Pointers in Each Node
Populating Next Right Pointers in Each Node
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 toNULL
.
Initially, all next pointers are set to NULL
.
Note:
- You may only use constant extra space.
- You may assume that it is a perfect binary tree (ie, all leaves are at the same level, and every parent has two children).
For example,
Given the following perfect binary tree,
1 / 2 3 / \ / 4 5 6 7
After calling your function, the tree should look like:
1 -> NULL / 2 -> 3 -> NULL / \ / 4->5->6->7 -> NULL
答案
/** * Definition for binary tree with next pointer. * public class TreeLinkNode { * int val; * TreeLinkNode left, right, next; * TreeLinkNode(int x) { val = x; } * } */ public class Solution { public void connect(TreeLinkNode root) { if(root==null) { return ; } TreeLinkNode firstUpper=root; TreeLinkNode pUpper; TreeLinkNode firstBelow; TreeLinkNode pBelow; while(firstUpper.left!=null) { pUpper=firstUpper; pBelow=pUpper.left; firstBelow=pBelow; while(true) { pBelow.next=pUpper.right; pBelow=pBelow.next; pUpper=pUpper.next; if(pUpper==null) { break; } pBelow.next=pUpper.left; pBelow=pBelow.next; } firstUpper=firstBelow; } } }
Populating Next Right Pointers in Each Node
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。