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"translatedContent": "<p>给定一个二叉树</p>\n\n<pre>\nstruct Node {\n int val;\n Node *left;\n Node *right;\n Node *next;\n}</pre>\n\n<p>填充它的每个 next 指针,让这个指针指向其下一个右侧节点。如果找不到下一个右侧节点,则将 next 指针设置为 <code>NULL</code>。</p>\n\n<p>初始状态下,所有 next 指针都被设置为 <code>NULL</code>。</p>\n\n<p> </p>\n\n<p><strong>进阶:</strong></p>\n\n<ul>\n\t<li>你只能使用常量级额外空间。</li>\n\t<li>使用递归解题也符合要求,本题中递归程序占用的栈空间不算做额外的空间复杂度。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>示例:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/02/15/117_sample.png\" style=\"height: 218px; width: 640px;\" /></p>\n\n<pre>\n<strong>输入</strong>:root = [1,2,3,4,5,null,7]\n<strong>输出:</strong>[1,#,2,3,#,4,5,7,#]\n<strong>解释:</strong>给定二叉树如图 A 所示,你的函数应该填充它的每个 next 指针,以指向其下一个右侧节点,如图 B 所示。序列化输出按层序遍历顺序(由 next 指针连接),'#' 表示每层的末尾。</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>树中的节点数小于 <code>6000</code></li>\n\t<li><code>-100 <= node.val <= 100</code></li>\n</ul>\n\n<p> </p>\n\n<ul>\n</ul>\n",
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