Image credit:https://leetcode.com/articles/binary-search-tree-iterator/ Solutions In order traversal using stack Note in next() method, we don't need to check if there is still element left in the stack. It is the caller's responsibility to check so. It is described in the Java'sIter...
Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Callingnext()will return the next smallest number in the BST. Note:next()andhasNext()should run in average O(1) time and uses O(h) memory, wherehis the height of t...
Left } } /** * Your BSTIterator object will be instantiated and called as such: * obj := Constructor(root); * param_1 := obj.Next(); * param_2 := obj.HasNext(); */ 题目链接: Binary Search Tree Iterator : leetcode.com/problems/b 二叉搜索树迭代器: leetcode-cn.com/problem ...
Can you solve this real interview question? Binary Search Tree Iterator - Implement the BSTIterator class that represents an iterator over the in-order traversal [https://en.wikipedia.org/wiki/Tree_traversal#In-order_(LNR)] of a binary search tree (BST):
题目: Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the next smallest number in the BST. Note: next() and hasNext() should run in average O(1) time and uses O(h) memory, where h ...
BSTIterator(TreeNode root)Initializes an object of theBSTIteratorclass. Therootof the BST is given as part of the constructor. The pointer should be initialized to a non-existent number smaller than any element in the BST. boolean hasNext()Returnstrueif there exists a number in the traversal...
LeetCode543. 二叉树的直径(python)解 binarytreenode.#classTreeNode(object): #def__init__(self,x): #self.val=x#self.left=None#self.right=NoneclassSolution(object):defdiameterOfBinaryTree(self, root): """ 100天每日一题(day13) 解答:还是用递归(DFS),设置depth记录层数(DFS,基本上都有两个...
下面是leetcode这道题目我的解答。没有使用O(1)空间复杂度,使用了O(n)空间复杂度。 还用到了Java里面 Arrays.sort方法,也需要注意toArray函数的参数。 1. AI检测代码解析 除了这种解法,还有一种,是我之前做的方法,也很好,通过两个数字记录可能出错的位置,很巧妙,在这个后面给出。
96. Unique Binary Search Trees (DP) Given n, how many structurally unique BST's (binary search trees) that store values 1 ... n? Example: 分析: 参考答案解法https://leetcode.com/problems/unique-binary-search-trees/solution/ G(n)是n个数字的BST个数,注意数字 96. Unique Binary Search Tr...
https://leetcode.com/problems/binary-search-tree-iterator/ 本人比较菜,一般看到这个就只想到,这个题目要求从小到大遍历一个二叉搜索树 ,当然就是中序遍历了。但是始终搞不明白题目的要求 next() and hasNext() should run in average O(1) time and uses O(h) memory, where h is the height of the...