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二叉树的左右子树交换 #141

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@sisterAn

Description

@sisterAn

翻转一棵二叉树。

示例:

输入:

     4
   /   \
  2     7
 / \   / \
1   3 6   9

输出:

     4
   /   \
  7     2
 / \   / \
9   6 3   1

leetcode

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