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):
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...
* public TreeNode(int x) { val = x; } * } */publicclassBSTIterator{privateStack<TreeNode>nodeStack;privatevoidPushLeft(TreeNode node){while(node!=null){nodeStack.Push(node);node=node.left;}}publicBSTIterator(TreeNode root){nodeStack=newStack<TreeNode>();PushLeft(root);}/** @return ...
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);...
Binary Search Tree Iterator Description Design an iterator over a binary search tree with the following rules: Elements are visited in ascending order (i.e. an in-order traversal) next()andhasNext()queries run in O(1) time in average....
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、…
Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. 调用next()将返回二叉搜索树中的下一个最小的数。 Callingnext()will return the next smallest number in the BST.
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...
简介:Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. ...
Binary Search Tree Iterator Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next()Note: next() and hasNext() should run in average O(1) time and uses O(h) memory...