[LeetCode]144.Binary Tree Preorder Traversal
【题目】 Given a binary tree, return the preorder traversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3]. Note: Recursive solution ...
LeetCode：144_Binary Tree Preorder Traversal | 二叉树的前序遍历 | Medium
题目：Binary Tree Preorder Traversal 二叉树的前序遍历，同样使用栈来解，代码如下： 1 struct TreeNode { 2 int val; 3 TreeNode* left; 4 TreeNode* right; 5 TreeNode(int x): val(x), left(NUL...
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