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26 lines
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26 lines
1.1 KiB
HTML
Given the <code>root</code> of a binary tree, return <em>the average value of the nodes on each level in the form of an array</em>. Answers within <code>10<sup>-5</sup></code> of the actual answer will be accepted.
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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/2021/03/09/avg1-tree.jpg" style="width: 277px; height: 302px;" />
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<pre>
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<strong>Input:</strong> root = [3,9,20,null,null,15,7]
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<strong>Output:</strong> [3.00000,14.50000,11.00000]
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Explanation: The average value of nodes on level 0 is 3, on level 1 is 14.5, and on level 2 is 11.
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Hence return [3, 14.5, 11].
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</pre>
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<p><strong>Example 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/03/09/avg2-tree.jpg" style="width: 292px; height: 302px;" />
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<pre>
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<strong>Input:</strong> root = [3,9,20,15,7]
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<strong>Output:</strong> [3.00000,14.50000,11.00000]
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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>The number of nodes in the tree is in the range <code>[1, 10<sup>4</sup>]</code>.</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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