totalNum += numTrees(start,i-1)*numTrees(i+1,end); return totalNum; } }; class Solution { public: int numTrees(int n) { if (n < 0) return 0; vector<int> trees(n+1, 0); trees[0] = 1; for(int i = 1; i <= n; i++) for (int j = 0; j < i; j++) trees[i] += trees[j] * trees[i-j-1]; ...
【leetcode】Unique Binary Search Trees 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...
LeetCode: 96. Unique Binary Search Trees 题目描述 Given n, how many structurally unique BST’s (binary search trees) that store values 1 … n? Example: Input: 3 Output: 5 Explanation: Given n = 3, there are a total of 5 unique BST's: 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3...
LeetCode Unique Binary Search Trees 1.题目 Givenn, how many structurally uniqueBST'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 1. 2. 3. 4....
Given an integer n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example, Given n = 3, your program should return all 5 unique BST's shown below. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 ...
来源：力扣（LeetCode） 链接：https://leetcode-cn.com/problems/unique-binary-search-trees-ii/ 著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。解法一：递归法首先，当n为0的时候，结果是一棵空树，直接返回空的list。当n大于0的时候，使用递归的方法来分别获取左右子树，递归过程...
95. Unique Binary Search Trees II(Medium)Given an integer n, generate all structurally unique BST's (binary search trees) that store values 1 ... n.Example:Input: 3 Output:[ [1,null,3,2], [3,2,null,1], [3,1,null,null,2], [2,1,3], [1,null,2,null,3]]Explanation:The ab...
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:
// #288 Description: Unique Word Abbreviation | LeetCode OJ 解法1:水题。 // Solution 1: Easy. 代码1 // Code 1 289 Game of Life // #289 生命游戏 描述:康威生命游戏 - 维基百科,自由的百科全书 // #289 Description: Game of Life | LeetCode OJ 解法1:既然规则这么复杂,咱们就照规矩办。
0095 Unique Binary Search Trees II Go 51.4% Medium 0096 Unique Binary Search Trees Go 59.2% Medium 0097 Interleaving String Go 37.1% Medium 0098 Validate Binary Search Tree Go 31.7% Medium 0099 Recover Binary Search Tree Go 50.2% Medium 0100 Same Tree Go 56.3% Easy 0101 Symmetric Tr...