A-剑指offer/剑指 Offer 27. 二叉树的镜像.ipynb

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    "[剑指 Offer 27. 二叉树的镜像](https://leetcode-cn.com/problems/er-cha-shu-de-jing-xiang-lcof/)\n",
    "\n",
    "```\n",
    "请完成一个函数，输入一个二叉树，该函数输出它的镜像。\n",
    "\n",
    "例如输入：\n",
    "\n",
    "     4\n",
    "   /   \\\n",
    "  2     7\n",
    " / \\   / \\\n",
    "1   3 6   9\n",
    "镜像输出：\n",
    "\n",
    "     4\n",
    "   /   \\\n",
    "  7     2\n",
    " / \\   / \\\n",
    "9   6 3   1\n",
    "\n",
    " \n",
    "\n",
    "示例 1：\n",
    "\n",
    "输入：root = [4,2,7,1,3,6,9]\n",
    "输出：[4,7,2,9,6,3,1]\n",
    "\n",
    "```"
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    "# Definition for a binary tree node.\n",
    "# class TreeNode:\n",
    "#     def __init__(self, x):\n",
    "#         self.val = x\n",
    "#         self.left = None\n",
    "#         self.right = None\n",
    "\n",
    "class Solution:\n",
    "    def mirrorTree(self, root: TreeNode) -> TreeNode:\n",
    "        if root==None:\n",
    "            return\n",
    "        \n",
    "        tmp = root.left\n",
    "        root.left = root.right\n",
    "        root.right = tmp\n",
    "\n",
    "        if root.left:\n",
    "            self.mirrorTree(root.left)\n",
    "        if root.right:\n",
    "            self.mirrorTree(root.right)\n",
    "\n",
    "        return root"
   ]
  }
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