class BSTIterator: # @param root, a binary search tree's root node def __init__(self, root): self.stack = [] self.cur = root # @return a boolean, whether we have a next smallest number def hasNext(self): return self.stack or self.cur # @return an integer, the next smallest ...
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...
详见:https://leetcode.com/problems/binary-search-tree-iterator/description/ Java实现: /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ class BSTIterator { private Stack<Tree...
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. 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,...
http://www.programcreek.com/2014/04/leetcode-binary-search-tree-iterator-java/ Anyway, Good luck, Richardo! My code: /** * Definition for binary tree * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } ...
该Iterator 算法即 non-recursion 的 inorder traversal,不仅仅适用于 BST,任何 Binary Tree 都可以 • stack 中保存一路走到当前节点的所有节点 • stack的栈顶 一直存储 iterator 指向的当前节点 • hasNext() 只需要判断 stack 是否为空 • next() 只需要返回 stack 的栈顶值,并将 iterator 挪到下一...
Binary Search Tree Iterator 2019-12-21 22:40 −Description Design an iterator over a binary search tree with the following rules: Elements are visited in ascending order (i.e. an in-order trav... YuriFLAG 0 148 nowcoder3274D binary ...
root = root.left; }else{ TreeNode node =stack.pop(); result.add(node.val); root = node.right; } }returnresult; } }
TreeSet A set backed by a red-black tree to keep the elements ordered with respect to the comparator. Implements Set, IteratorWithIndex, EnumerableWithIndex, JSONSerializer and JSONDeserializer interfaces. package main import "github.com/emirpasic/gods/sets/treeset" func main() { set := tree...
* 题目: 173.Binary Search Tree Iterator * 来源:https://oj.leetcode.com/problems/binary-search-tree-iterator/ * 结果:AC * 来源:LeetCode * 博客: ***/ #include <iostream> #include <stack> #include <vector> using namespace std; // 二叉...