leetcode 669. Trim a Binary Search Tree
来源:互联网 发布:win10装mac虚拟机 编辑:程序博客网 时间:2024/04/30 01:15
Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements lies in [L, R] (R >= L). You might need to change the root of the tree, so the result should return the new root of the trimmed binary search tree.
Example 1: Input: 1 / \ 0 2 L = 1 R = 2 Output: 1 \ 2
题目大致意思就是给定一个二叉树和一个范围L和R,让你返回所有元素在范围内的二叉树。
解决思路:
- 首先,如果该节点是空的就返回空的。
- 然后,如果该节点比L还要小,那肯定让该节点和它的右节点里面找。 反之,如果该节点比R还要大,那跟它的左节点里找。
- 上面都不是,那这个节点肯定是在范围了,所以它的左节点就从它的左节点里找,右节点从它的右节点里找。代码用递归可以实现。
代码如下:
/** * Definition for a binary tree node. * struct TreeNode { * int val; * struct TreeNode *left; * struct TreeNode *right; * }; */struct TreeNode* trimBST(struct TreeNode* root, int L, int R) { if (root == NULL) return NULL; if (root->val < L) return trimBST(root->right, L, R); if (root->val > R) return trimBST(root->left, L, R); root->left = trimBST(root->left, L, R); root->right = trimBST(root->right, L, R); return root;}
阅读全文
0 0
- leetcode 669. Trim a Binary Search Tree
- leetcode 669. Trim a Binary Search Tree
- leetcode 669. Trim a Binary Search Tree
- LeetCode 669. Trim a Binary Search Tree
- leetcode 669. Trim a Binary Search Tree
- leetcode: 669. Trim a Binary Search Tree
- <LeetCode>669. Trim a Binary Search Tree
- leetcode 669. Trim a Binary Search Tree
- LeetCode 669. Trim a Binary Search Tree
- [LeetCode] 669.Trim a Binary Search Tree
- [LeetCode] 669.Trim a Binary Search Tree
- 【LeetCode】669 Trim a Binary Search Tree
- Trim a Binary Search Tree(leetcode)
- leetcode- Add to List 669. Trim a Binary Search Tree
- 【LeetCode】669.Trim a Binary Search Tree解题报告
- LeetCode 669. Trim a Binary Search Tree (Easy)
- 669. Trim a Binary Search Tree
- 669. Trim a Binary Search Tree
- 数据结构(2)--计算时间复杂度
- 习题 7.11 写一个函数,用“起泡法”对输入的10个字符按由小到大顺序排列。
- C语言:多维数组做函数参数
- Android给View设置动画没有效果
- 2017西安网络赛B_Coin
- leetcode 669. Trim a Binary Search Tree
- 简单实现不一样的炫酷Toast
- 网络编程udp/tcp/tomcat
- n个人从m个啤酒龙头接啤酒,需要多久接完?
- Eclipse报错Could not write metadata for '/RemoteSystemsTempFiles'.D:\Program Files\eclipse\workspace\.
- caffe中出现loss等于nan
- 欢迎使用CSDN-markdown编辑器
- Java中getResourceAsStream的用法
- ES6第一章关于let和const不得不说的故事