LeetCode 144. Binary Tree Preorder Traversal

Description

https://leetcode.com/problems/binary-tree-preorder-traversal/description/

Given a binary tree, return the preorder traversal of its nodes’ values.

For example:
Given binary tree {1,#,2,3},

return [1,2,3].

Note: Recursive solution is trivial, could you do it iteratively?

Explanation

To return the preorder traversal of tree nodes values iteratively, we introduce a stack. With a stack, we can easily iterative nodes with preorder (root, left, right) sequence.

Video Tutorial

Java Solution

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