zoukankan      html  css  js  c++  java
  • Leetcode

    Leetcode - 623 - Add One Row to Tree

    623. Add One Row to Tree

    Given the root of a binary tree, then value v and depth d, you need to add a row of nodes with value v at the given depth d. The root node is at depth 1.

    The adding rule is: given a positive integer depth d, for each NOT null tree nodes N in depth d-1, create two tree nodes with value vas N's left subtree root and right subtree root. And N's original left subtree should be the left subtree of the new left subtree root, its original right subtree should be the right subtree of the new right subtree root. If depth d is 1 that means there is no depth d-1 at all, then create a tree node with value v as the new root of the whole original tree, and the original tree is the new root's left subtree.

    Example 1:

    Input: 
    A binary tree as following:
           4
         /   
        2     6
       /    / 
      3   1 5   
    
    v = 1
    
    d = 2
    
    Output: 
           4
          / 
         1   1
        /     
       2       6
      /      / 
     3   1   5   
    
    

    Example 2:

    Input: 
    A binary tree as following:
          4
         /   
        2    
       /    
      3   1    
    
    v = 1
    
    d = 3
    
    Output: 
          4
         /   
        2
       /     
      1   1
     /       
    3       1
    

    Note:

    1. The given d is in range [1, maximum depth of the given tree + 1].
    2. The given binary tree has at least one tree node.

    题解: 

      一般 tree 的问题都使用recursion 来解决。 注意在root 与 child 之间插入node的区别。 

    /**
     * Definition for a binary tree node.
     * struct TreeNode {
     *     int val;
     *     TreeNode *left;
     *     TreeNode *right;
     *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
     * };
     */
    class Solution {
    public:
        TreeNode* addOneRow(TreeNode* root, int v, int d) {
            if(d == 1){
                TreeNode *ans = new TreeNode(v); 
                ans->left = root; 
                return ans; 
            }else if(d == 2){
                TreeNode *lf = new TreeNode(v); 
                lf->left = root->left; 
                lf->right = NULL; 
                root->left = lf; 
                
                TreeNode *rg = new TreeNode(v); 
                rg->right = root->right; 
                rg->left = NULL; 
                root->right = rg;
                
                return root; 
            }else{
                if(root->left != NULL){
                    addOneRow(root->left, v, d-1); 
                }
                if(root->right != NULL){
                    addOneRow(root->right, v, d-1); 
                }
            }
            return root; 
        }
    };
    

      

  • 相关阅读:
    Python3与Python2的区别(转载)
    Python——通过斐波那契数列来理解生成器
    Solr4.8.1与Tomcat7整合
    Solr配置与简单Demo
    lucene 4.4 demo
    企业级搜索引擎Solr使用入门指南
    Solr使用入门指南
    使用solr搭建你的全文检索
    Solr 1.3 安装步骤
    Lucene/Solr开发经验
  • 原文地址:https://www.cnblogs.com/zhang-yd/p/7067238.html
Copyright © 2011-2022 走看看