leetcode-problemset/leetcode-cn/originData/average-of-levels-in-binary-tree.json

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        "question": {
            "questionId": "637",
            "questionFrontendId": "637",
            "categoryTitle": "Algorithms",
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            "title": "Average of Levels in Binary Tree",
            "titleSlug": "average-of-levels-in-binary-tree",
            "content": "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.\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/09/avg1-tree.jpg\" style=\"width: 277px; height: 302px;\" />\n<pre>\n<strong>Input:</strong> root = [3,9,20,null,null,15,7]\n<strong>Output:</strong> [3.00000,14.50000,11.00000]\nExplanation: The average value of nodes on level 0 is 3, on level 1 is 14.5, and on level 2 is 11.\nHence return [3, 14.5, 11].\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/09/avg2-tree.jpg\" style=\"width: 292px; height: 302px;\" />\n<pre>\n<strong>Input:</strong> root = [3,9,20,15,7]\n<strong>Output:</strong> [3.00000,14.50000,11.00000]\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the tree is in the range <code>[1, 10<sup>4</sup>]</code>.</li>\n\t<li><code>-2<sup>31</sup> &lt;= Node.val &lt;= 2<sup>31</sup> - 1</code></li>\n</ul>\n",
            "translatedTitle": "二叉树的层平均值",
            "translatedContent": "<p>给定一个非空二叉树的根节点<meta charset=\"UTF-8\" />&nbsp;<code>root</code>&nbsp;, 以数组的形式返回每一层节点的平均值。与实际答案相差&nbsp;<code>10<sup>-5</sup></code> 以内的答案可以被接受。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/09/avg1-tree.jpg\" /></p>\n\n<pre>\n<strong>输入：</strong>root = [3,9,20,null,null,15,7]\n<strong>输出：</strong>[3.00000,14.50000,11.00000]\n<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 。\n因此返回 [3, 14.5, 11] 。\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/03/09/avg2-tree.jpg\" /></p>\n\n<pre>\n<strong>输入：</strong>root = [3,9,20,15,7]\n<strong>输出：</strong>[3.00000,14.50000,11.00000]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<p><meta charset=\"UTF-8\" /></p>\n\n<ul>\n\t<li>树中节点数量在&nbsp;<code>[1, 10<sup>4</sup>]</code> 范围内</li>\n\t<li><code>-2<sup>31</sup>&nbsp;&lt;= Node.val &lt;= 2<sup>31</sup>&nbsp;- 1</code></li>\n</ul>\n",
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                    "code": "/**\n * Definition for a binary tree node.\n * struct TreeNode {\n *     int val;\n *     TreeNode *left;\n *     TreeNode *right;\n *     TreeNode() : val(0), left(nullptr), right(nullptr) {}\n *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}\n *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}\n * };\n */\nclass Solution {\npublic:\n    vector<double> averageOfLevels(TreeNode* root) {\n\n    }\n};",
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                    "code": "/**\n * Definition for a binary tree node.\n * class TreeNode {\n *     val: number\n *     left: TreeNode | null\n *     right: TreeNode | null\n *     constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {\n *         this.val = (val===undefined ? 0 : val)\n *         this.left = (left===undefined ? null : left)\n *         this.right = (right===undefined ? null : right)\n *     }\n * }\n */\n\nfunction averageOfLevels(root: TreeNode | null): number[] {\n    \n};",
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href=\\\"https:\\/\\/github.com\\/emirpasic\\/gods\\/tree\\/v1.18.1\\\" target=\\\"_blank\\\">https:\\/\\/godoc.org\\/github.com\\/emirpasic\\/gods@v1.18.1<\\/a> \\u7b2c\\u4e09\\u65b9\\u5e93\\u3002<\\/p>\"],\"python3\":[\"Python3\",\"<p>\\u7248\\u672c\\uff1a<code>Python 3.10<\\/code><\\/p>\\r\\n\\r\\n<p>\\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982<a href=\\\"https:\\/\\/docs.python.org\\/3\\/library\\/array.html\\\" target=\\\"_blank\\\">array<\\/a>, <a href=\\\"https:\\/\\/docs.python.org\\/3\\/library\\/bisect.html\\\" target=\\\"_blank\\\">bisect<\\/a>, <a href=\\\"https:\\/\\/docs.python.org\\/3\\/library\\/collections.html\\\" target=\\\"_blank\\\">collections<\\/a>\\u3002 \\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n<p>\\u5982\\u9700\\u4f7f\\u7528 Map\\/TreeMap 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