LeetCode Flatten Binary Tree to Linked List (dfs)

问题：给出一个二叉树，按照前序遍历方式转变成一个链表。

思路：

将节点的右子树链接到左子树的最右结点，同时将结点的左子树赋值给当前结点的右孩子结点。依次这样处理即可。

具体代码参考：

https://github.com/wuli2496/OJ/tree/master/LeetCode/Flatten%20Binary%20Tree%20to%20Linked%20List

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