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37 lines
1.3 KiB
HTML
37 lines
1.3 KiB
HTML
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<p>给定一个 n 叉树的根节点 <meta charset="UTF-8" /> <code>root</code> ，返回 <em>其节点值的<strong> 前序遍历</strong></em> 。</p>
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<p>n 叉树 在输入中按层序遍历进行序列化表示，每组子节点由空值 <code>null</code> 分隔（请参见示例）。</p>
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<p><br />
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<strong>示例 1：</strong></p>
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<p><img src="https://assets.leetcode.com/uploads/2018/10/12/narytreeexample.png" style="height: 193px; width: 300px;" /></p>
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<pre>
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<strong>输入：</strong>root = [1,null,3,2,4,null,5,6]
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<strong>输出：</strong>[1,3,5,6,2,4]
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</pre>
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<p><strong>示例 2：</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2019/11/08/sample_4_964.png" style="height: 272px; width: 300px;" /></p>
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<pre>
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<strong>输入：</strong>root = [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]
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<strong>输出：</strong>[1,2,3,6,7,11,14,4,8,12,5,9,13,10]
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li>节点总数在范围<meta charset="UTF-8" /> <code>[0, 10<sup>4</sup>]</code>内</li>
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<li><code>0 <= Node.val <= 10<sup>4</sup></code></li>
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<li>n 叉树的高度小于或等于 <code>1000</code></li>
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</ul>
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<p> </p>
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<p><strong>进阶：</strong>递归法很简单，你可以使用迭代法完成此题吗?</p>
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