leetcode-problemset/leetcode-cn/originData/tree-node.json

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        "question": {
            "questionId": "608",
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            "categoryTitle": "Database",
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            "title": "Tree Node",
            "titleSlug": "tree-node",
            "content": "<p>Table: <code>Tree</code></p>\n\n<pre>\n+-------------+------+\n| Column Name | Type |\n+-------------+------+\n| id          | int  |\n| p_id        | int  |\n+-------------+------+\nid is the column with unique values for this table.\nEach row of this table contains information about the id of a node and the id of its parent node in a tree.\nThe given structure is always a valid tree.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Each node in the tree can be one of three types:</p>\n\n<ul>\n\t<li><strong>&quot;Leaf&quot;</strong>: if the node is a leaf node.</li>\n\t<li><strong>&quot;Root&quot;</strong>: if the node is the root of the tree.</li>\n\t<li><strong>&quot;Inner&quot;</strong>: If the node is neither a leaf node nor a root node.</li>\n</ul>\n\n<p>Write a solution to report the type of each node in the tree.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/10/22/tree1.jpg\" style=\"width: 304px; height: 224px;\" />\n<pre>\n<strong>Input:</strong> \nTree table:\n+----+------+\n| id | p_id |\n+----+------+\n| 1  | null |\n| 2  | 1    |\n| 3  | 1    |\n| 4  | 2    |\n| 5  | 2    |\n+----+------+\n<strong>Output:</strong> \n+----+-------+\n| id | type  |\n+----+-------+\n| 1  | Root  |\n| 2  | Inner |\n| 3  | Leaf  |\n| 4  | Leaf  |\n| 5  | Leaf  |\n+----+-------+\n<strong>Explanation:</strong> \nNode 1 is the root node because its parent node is null and it has child nodes 2 and 3.\nNode 2 is an inner node because it has parent node 1 and child node 4 and 5.\nNodes 3, 4, and 5 are leaf nodes because they have parent nodes and they do not have child nodes.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/10/22/tree2.jpg\" style=\"width: 64px; height: 65px;\" />\n<pre>\n<strong>Input:</strong> \nTree table:\n+----+------+\n| id | p_id |\n+----+------+\n| 1  | null |\n+----+------+\n<strong>Output:</strong> \n+----+-------+\n| id | type  |\n+----+-------+\n| 1  | Root  |\n+----+-------+\n<strong>Explanation:</strong> If there is only one node on the tree, you only need to output its root attributes.\n</pre>\n",
            "translatedTitle": "树节点",
            "translatedContent": "<p>表：<code>Tree</code></p>\n\n<pre>\n+-------------+------+\n| Column Name | Type |\n+-------------+------+\n| id          | int  |\n| p_id        | int  |\n+-------------+------+\nid 是该表中具有唯一值的列。\n该表的每行包含树中节点的 id 及其父节点的 id 信息。\n给定的结构总是一个有效的树。\n</pre>\n\n<p>&nbsp;</p>\n\n<p>树中的每个节点可以是以下三种类型之一：</p>\n\n<ul>\n\t<li><strong>\"Leaf\"</strong>：节点是叶子节点。</li>\n\t<li><strong>\"Root\"</strong>：节点是树的根节点。</li>\n\t<li><strong>\"lnner\"</strong>：节点既不是叶子节点也不是根节点。</li>\n</ul>\n\n<p>编写一个解决方案来报告树中每个节点的类型。</p>\n\n<p>以 <strong>任意顺序</strong> 返回结果表。</p>\n\n<p>结果格式如下所示。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/10/22/tree1.jpg\" style=\"width: 304px; height: 224px;\" />\n<pre>\n<b>输入：</b>\nTree table:\n+----+------+\n| id | p_id |\n+----+------+\n| 1  | null |\n| 2  | 1    |\n| 3  | 1    |\n| 4  | 2    |\n| 5  | 2    |\n+----+------+\n<b>输出：</b>\n+----+-------+\n| id | type  |\n+----+-------+\n| 1  | Root  |\n| 2  | Inner |\n| 3  | Leaf  |\n| 4  | Leaf  |\n| 5  | Leaf  |\n+----+-------+\n<b>解释：</b>\n节点 1 是根节点，因为它的父节点为空，并且它有子节点 2 和 3。\n节点 2 是一个内部节点，因为它有父节点 1 和子节点 4 和 5。\n节点 3、4 和 5 是叶子节点，因为它们有父节点而没有子节点。\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/10/22/tree2.jpg\" style=\"width: 64px; height: 65px;\" />\n<pre>\n<b>输入：</b>\nTree table:\n+----+------+\n| id | p_id |\n+----+------+\n| 1  | null |\n+----+------+\n<b>输出：</b>\n+----+-------+\n| id | type  |\n+----+-------+\n| 1  | Root  |\n+----+-------+\n<b>解释：</b>如果树中只有一个节点，则只需要输出其根属性。\n</pre>\n",
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            "hints": [
                "You can judge the node type by querying whether the node's id shows up in p_id column and whether the node's p_id is null."
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            "sampleTestCase": "{\"headers\":{\"Tree\":[\"id\",\"p_id\"]},\"rows\":{\"Tree\":[[1,null],[2,1],[3,1],[4,2],[5,2]]}}",
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                "Create table If Not Exists Tree (id int, p_id int)",
                "Truncate table Tree",
                "insert into Tree (id, p_id) values ('1', 'None')",
                "insert into Tree (id, p_id) values ('2', '1')",
                "insert into Tree (id, p_id) values ('3', '1')",
                "insert into Tree (id, p_id) values ('4', '2')",
                "insert into Tree (id, p_id) values ('5', '2')"
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