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"translatedContent": "<p>给你一棵二叉树的根节点 <code>root</code> ,树中有 <code>n</code> 个节点,每个节点都有一个不同于其他节点且处于 <code>1</code> 到 <code>n</code> 之间的值。</p>\n\n<p>另给你一个由 <code>n</code> 个值组成的行程序列 <code>voyage</code> ,表示 <strong>预期</strong> 的二叉树 <a href=\"https://baike.baidu.com/item/%E5%85%88%E5%BA%8F%E9%81%8D%E5%8E%86/6442839?fr=aladdin\" target=\"_blank\"><strong>先序遍历</strong></a> 结果。</p>\n\n<p>通过交换节点的左右子树,可以 <strong>翻转</strong> 该二叉树中的任意节点。例,翻转节点 1 的效果如下:</p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/02/15/fliptree.jpg\" style=\"width: 400px; height: 187px;\" />\n<p>请翻转 <strong>最少 </strong>的树中节点,使二叉树的 <strong>先序遍历</strong> 与预期的遍历行程 <code>voyage</code> <strong>相匹配</strong> 。 </p>\n\n<p>如果可以,则返回 <strong>翻转的</strong> 所有节点的值的列表。你可以按任何顺序返回答案。如果不能,则返回列表 <code>[-1]</code>。</p>\n\n<p> </p>\n\n<p><strong>示例 1</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/01/02/1219-01.png\" style=\"width: 150px; height: 205px;\" />\n<pre>\n<strong>输入:</strong>root = [1,2], voyage = [2,1]\n<strong>输出:</strong>[-1]\n<strong>解释:</strong>翻转节点无法令先序遍历匹配预期行程。\n</pre>\n\n<p><strong>示例 2</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/01/02/1219-02.png\" style=\"width: 150px; height: 142px;\" />\n<pre>\n<strong>输入:</strong>root = [1,2,3], voyage = [1,3,2]\n<strong>输出:</strong>[1]\n<strong>解释:</strong>交换节点 2 和 3 来翻转节点 1 ,先序遍历可以匹配预期行程。</pre>\n\n<p><strong>示例 3</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/01/02/1219-02.png\" style=\"width: 150px; height: 142px;\" />\n<pre>\n<strong>输入:</strong>root = [1,2,3], voyage = [1,2,3]\n<strong>输出:</strong>[]\n<strong>解释:</strong>先序遍历已经匹配预期行程,所以不需要翻转节点。\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>树中的节点数目为 <code>n</code></li>\n\t<li><code>n == voyage.length</code></li>\n\t<li><code>1 <= n <= 100</code></li>\n\t<li><code>1 <= Node.val, voyage[i] <= n</code></li>\n\t<li>树中的所有值 <strong>互不相同</strong></li>\n\t<li><code>voyage</code> 中的所有值 <strong>互不相同</strong></li>\n</ul>\n",
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