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"translatedContent": "<p>给你一个二叉树的根节点 <code>root</code> ,判断其是否是一个有效的二叉搜索树。</p>\n\n<p><strong>有效</strong> 二叉搜索树定义如下:</p>\n\n<ul>\n\t<li>节点的左子树只包含<strong> 小于 </strong>当前节点的数。</li>\n\t<li>节点的右子树只包含 <strong>大于</strong> 当前节点的数。</li>\n\t<li>所有左子树和右子树自身必须也是二叉搜索树。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/12/01/tree1.jpg\" style=\"width: 302px; height: 182px;\" />\n<pre>\n<strong>输入:</strong>root = [2,1,3]\n<strong>输出:</strong>true\n</pre>\n\n<p><strong>示例 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/12/01/tree2.jpg\" style=\"width: 422px; height: 292px;\" />\n<pre>\n<strong>输入:</strong>root = [5,1,4,null,null,3,6]\n<strong>输出:</strong>false\n<strong>解释:</strong>根节点的值是 5 ,但是右子节点的值是 4 。\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>树中节点数目范围在<code>[1, 10<sup>4</sup>]</code> 内</li>\n\t<li><code>-2<sup>31</sup> <= Node.val <= 2<sup>31</sup> - 1</code></li>\n</ul>\n",
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