*/classBSTIterator{private:stack<TreeNode*>nodeStack;voidpushLeft(TreeNode*node){while(node){nodeStack.push(node);node=node->left;}}public:BSTIterator(TreeNode*root){pushLeft(root);}/** @return whether we have a next smallest number */boolhasNext(){return!nodeStack.empty();}/** @retur...
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):
Description:Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST.Calling next() will r
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 the...
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 ...
Leet Code 第173题Binary Search Tree Iterator 解题思路 Loading...1、读题,题目要求为BST 实现一个迭代器,有二个方法,next 和hasNext 方法。 2、先按照中序遍历,变成一个数组或list等,再按照索引取值。 3、…
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...
next() and hasNext() should run in average O(1) time and uses O(h) memory, where h is the height of the tree.
https://leetcode.com/problems/binary-search-tree-iterator/ 题目描述 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. ...
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