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32 lines
1.3 KiB
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32 lines
1.3 KiB
HTML
<p>给定两个整数数组 <code>preorder</code> 和 <code>inorder</code> ，其中 <code>preorder</code> 是二叉树的<strong>先序遍历</strong>， <code>inorder</code> 是同一棵树的<strong>中序遍历</strong>，请构造二叉树并返回其根节点。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/02/19/tree.jpg" style="height: 302px; width: 277px;" />
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<pre>
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<strong>输入</strong><strong>:</strong> preorder = [3,9,20,15,7], inorder = [9,3,15,20,7]
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<strong>输出:</strong> [3,9,20,null,null,15,7]
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</pre>
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<p><strong>示例 2:</strong></p>
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<pre>
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<strong>输入:</strong> preorder = [-1], inorder = [-1]
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<strong>输出:</strong> [-1]
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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><code>1 <= preorder.length <= 3000</code></li>
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<li><code>inorder.length == preorder.length</code></li>
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<li><code>-3000 <= preorder[i], inorder[i] <= 3000</code></li>
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<li><code>preorder</code> 和 <code>inorder</code> 均 <strong>无重复</strong> 元素</li>
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<li><code>inorder</code> 均出现在 <code>preorder</code></li>
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<li><code>preorder</code> <strong>保证</strong> 为二叉树的前序遍历序列</li>
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<li><code>inorder</code> <strong>保证</strong> 为二叉树的中序遍历序列</li>
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</ul>
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