1. Unique Binary Search Trees Givenn, how many structurally unique BST's (binary search trees) that store values 1...n? For example, Givenn= 3, there are a total of 5 unique BST's. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 思路:和 Unique Binary Searc...
1/**2* Definition for binary tree3* struct TreeNode {4* int val;5* TreeNode *left;6* TreeNode *right;7* TreeNode(int x) : val(x), left(NULL), right(NULL) {}8* };9*/10classSolution {11public:12vector<TreeNode *> generateTrees(intn) {13//IMPORTANT: Please reset any member...
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...
题目地址:https://leetcode.com/problems/unique-binary-search-trees/description/ 题目描述 Givenn, how many structurally unique BST’s (binary search trees) that store values1...n? For example, Given n = 3, there are a total of 5 unique BST's. 1 3 3 2 1 \ / / / \ \ 3 2 1 1...
@(LeetCode) 问题描述 给定一个整数n,能构造出多少种BST,使其节点值包括1~n? 栗子: 输入:3 输出:5 解释: 可构造出 5 种 BST,如下所示: 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 想看英文原文的戳这里。
1038 Binary Search Tree to Greater Sum Tree 从二叉搜索树到更大和树 Description: Given the root of a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus the sum of all keys greater than the original key in...
Postorder(左子树、右子树、根, Depth-first Search) Level order(Breath-first Search) leetcode: 144, 94, 145 Tree structNode{Node*left;Node*right;intdata;};Node*root=...;// 假設已經建立二元樹了 Preorder // preorder traversalvoidtraversal(Node*p){if(!p)return;cout<<p->data;// 先輸出樹...
Given an integern, returnthe number of structurally uniqueBST's (binary search trees) which has exactlynnodes of unique values from1ton. Example 1: Input:n = 3Output:5 Example 2: Input:n = 1Output:1 Constraints: 1 <= n <= 19 ...
The right subtree of a node contains only nodes with keysgreater thanthe node's key. Both the left and right subtrees must also be binary search trees. Example 1: 2 / \ 1 3 Binary tree[2,1,3], return true. Example 2: 1
Both the left and right subtrees must also be binary search trees. confused what"{1,#,2,3}"means?> read more on how binary tree is serialized on OJ. 这道题就一个难点:要会设置节点的两边限制值。 吸收了LeetCode论坛上的建议,不使用INT_MAX 和INT_MIN,我这里使用了LLONG_MIN和LLONG_MAX。