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35 lines
1.1 KiB
HTML
35 lines
1.1 KiB
HTML
<p>给定一个非空二叉树的根节点<meta charset="UTF-8" /> <code>root</code> , 以数组的形式返回每一层节点的平均值。与实际答案相差 <code>10<sup>-5</sup></code> 以内的答案可以被接受。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2021/03/09/avg1-tree.jpg" /></p>
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<pre>
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<strong>输入：</strong>root = [3,9,20,null,null,15,7]
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<strong>输出：</strong>[3.00000,14.50000,11.00000]
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<strong>解释：</strong>第 0 层的平均值为 3,第 1 层的平均值为 14.5,第 2 层的平均值为 11 。
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因此返回 [3, 14.5, 11] 。
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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/2021/03/09/avg2-tree.jpg" /></p>
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<pre>
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<strong>输入：</strong>root = [3,9,20,15,7]
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<strong>输出：</strong>[3.00000,14.50000,11.00000]
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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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<p><meta charset="UTF-8" /></p>
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<ul>
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<li>树中节点数量在 <code>[1, 10<sup>4</sup>]</code> 范围内</li>
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<li><code>-2<sup>31</sup> <= Node.val <= 2<sup>31</sup> - 1</code></li>
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</ul>
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