[LeetCode] 173. Binary Search Tree Iterator Java 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 ...
Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. 实现一个适用于二叉查找树的迭代器,该迭代器通过二叉查找树的根结点来实例化。 Calling next() will return the next sm... ...
1import java.util.ArrayDeque;2import java.util.Stack;345public class BSTIterator {6private ArrayDeque<TreeNode>mArrayDeque;78public BSTIterator(TreeNode root) {9mArrayDeque =newArrayDeque<TreeNode>();10bTreeInorderTraverse(root);11}1213privatevoidbTreeInorderTraverse(TreeNode root) {14TreeNode p =...
leetcode.com/problems/binary-search-tree-iterator/ 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、该题关键点是索引的边界条件。 下面黄哥用Python、Go、Java 三种语言实现的代码。 Python 代码 # Definition ...
class BSTIterator { Queue<Integer> queue = new LinkedList<>(); public BSTIterator(TreeNode root) { inorderTraversal(root); } private void inorderTraversal(TreeNode root) { if (root == null) { return; } inorderTraversal(root.left); queue.offer(root.val); inorderTraversal(root.right);...
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 ...
Java 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classBSTIterator{Stack<TreeNode>stack;publicBSTIterator(TreeNode root){this.stack=newStack<>();leftInorder(root);}privatevoidleftInorder(TreeNode node){while(node!=null){this.stack.add(node);node=node.left;}}/** @return the next sma...
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) ti...
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 is the...
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):