zoukankan      html  css  js  c++  java
  • [LeetCode] Populating Next Right Pointers in Each Node 深度搜索

    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, 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
    
    Hide Tags
     Tree Depth-first Search
     
     
        这是一个深度搜索问题,也可以用其他的方法。
     
    #include <iostream>
    using namespace std;
    
    /**
     * Definition for binary tree with next pointer.
     */
    struct TreeLinkNode {
     int val;
     TreeLinkNode *left, *right, *next;
     TreeLinkNode(int x) : val(x), left(NULL), right(NULL), next(NULL) {}
    };
    
    class Solution {
    public:
        void connect(TreeLinkNode *root) {
            if(root==NULL||root->left==NULL)  return;
            connect(root->left);
            help_fun(root->left,root->right);
            connect(root->right);
        }
        void help_fun(TreeLinkNode* lft,TreeLinkNode *rgt)
        {
            if(lft==NULL)   return ;
            lft->next = rgt;
            rgt->next = NULL;
            help_fun(lft->right,rgt->left);
        }
    };
    
    int main()
    {
    
        return 0;
    }
     
  • 相关阅读:
    pyqt笔记1模块 信号和插槽
    pyqt5 eric6 pyqt5-tools
    转入Python3.5
    ARM伪指令
    ARM MOV PC加8
    所有JTAG集成电路都应该支持菊花链
    冯诺依曼存储子系统的改进
    [分享]Active-HDL 9.2 安装
    运行python脚本后台执行
    scala实验 模拟图形绘制
  • 原文地址:https://www.cnblogs.com/Azhu/p/4334830.html
Copyright © 2011-2022 走看看