3. Binary Tree Zigzag Level Order Traversal Given a binary tree, return thezigzag level ordertraversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). For example: Given binary tree[3,9,20,null,null,15,7], 3 / \ 9 20 ...
[LeetCode] 95. Unique Binary Search Trees II 独一无二的二叉搜索树之二 CategoryDifficultyLikesDislikes algorithms Medium (62.81%) 407 - TagsCompanies给定一个整数 n,生成所有由 1 ... n 为节点所组成的 二叉搜索树 。示例:输入:3输出:[ [1,null,3,2], [3,2,null,1], [3,1,null,null,2]...
Unique Binary Search Trees -- LeetCode 这道题要求可行的二叉查找树的数量,事实上二叉查找树能够随意取根,仅仅要满足中序遍历有序的要求就能够。从处理子问题的角度来看,选取一个结点为根,就把结点切成左右子树,以这个结点为根的可行二叉树数量就是左右子树可行二叉树数量的乘积,所以总的数量是将以全部结点为根...
#include <iostream>#include<vector>#include<algorithm>#include<queue>#include<stack>usingnamespacestd;//Definition for binary treestructTreeNode {intval; TreeNode*left; TreeNode*right; TreeNode(intx) : val(x), left(NULL), right(NULL) {} };classSolution {public: vector<TreeNode *> generate...
95. Unique Binary Search Trees II Given an integer n, generate all structurally unique BST's (binary search trees) that store values 1 ... n. Example: Input:3Output:[ [1,null,3,2],[3,2,null,1],[3,1,null,null,2], [2,1,3],[1,null,2,null,3]]Explanation:The above output ...
Unique Binary Search Trees II: https://leetcode.com/problems/unique-binary-search-trees-ii/description/ 解题思路: 思想如上题,但是在每一步需要create TreeeNode class Solution { public List<TreeNode> generateTrees(int n) { List<TreeNode>[]dp=newList[n+1];dp[0]=newArrayList<TreeNode>();if...
如何使用 Python 生成所有结构独特的二叉搜索树? 在LeetCode 的 Unique Binary Search Trees II 问题中,如何确定递归的基准情况? 生成所有独特的二叉搜索树时,如何处理空树的情况? 题目大意 给出一个n,求1-n能够得到的所有二叉搜索树,输出所有树 解题思路 递归拼接树 该题较难,参考题解的思路。 从start到end,...
* 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: vector<TreeNode*> generateTrees(int n) { ...
96. 不同的二叉搜索树 - 给你一个整数 n ,求恰由 n 个节点组成且节点值从 1 到 n 互不相同的 二叉搜索树 有多少种?返回满足题意的二叉搜索树的种数。 示例 1: [https://assets.leetcode.com/uploads/2021/01/18/uniquebstn3.jpg] 输入:n = 3 输出:5 示例 2:
// Source : https://oj.leetcode.com/problems/unique-binary-search-trees-ii/ // Author : 18plusui // Date : 2016-03-08/*** * * Given n, generate all structurally unique BST's (binary search treesthat store values 1...n. * * For example, * Given n = 3, your program...