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30 lines
1.3 KiB
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30 lines
1.3 KiB
HTML
<p>Given two integer arrays <code>preorder</code> and <code>inorder</code> where <code>preorder</code> is the preorder traversal of a binary tree and <code>inorder</code> is the inorder traversal of the same tree, construct and return <em>the binary tree</em>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/02/19/tree.jpg" style="width: 277px; height: 302px;" />
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<pre>
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<strong>Input:</strong> preorder = [3,9,20,15,7], inorder = [9,3,15,20,7]
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<strong>Output:</strong> [3,9,20,null,null,15,7]
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> preorder = [-1], inorder = [-1]
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<strong>Output:</strong> [-1]
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</pre>
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<p> </p>
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<p><strong>Constraints:</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> and <code>inorder</code> consist of <strong>unique</strong> values.</li>
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<li>Each value of <code>inorder</code> also appears in <code>preorder</code>.</li>
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<li><code>preorder</code> is <strong>guaranteed</strong> to be the preorder traversal of the tree.</li>
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<li><code>inorder</code> is <strong>guaranteed</strong> to be the inorder traversal of the tree.</li>
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</ul>
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