mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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175 lines
22 KiB
JSON
175 lines
22 KiB
JSON
{
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"question": {
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"questionId": "2060",
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"questionFrontendId": "1932",
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"boundTopicId": null,
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"title": "Merge BSTs to Create Single BST",
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"titleSlug": "merge-bsts-to-create-single-bst",
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"content": "<p>You are given <code>n</code> <strong>BST (binary search tree) root nodes</strong> for <code>n</code> separate BSTs stored in an array <code>trees</code> (<strong>0-indexed</strong>). Each BST in <code>trees</code> has <strong>at most 3 nodes</strong>, and no two roots have the same value. In one operation, you can:</p>\n\n<ul>\n\t<li>Select two <strong>distinct</strong> indices <code>i</code> and <code>j</code> such that the value stored at one of the <strong>leaves </strong>of <code>trees[i]</code> is equal to the <strong>root value</strong> of <code>trees[j]</code>.</li>\n\t<li>Replace the leaf node in <code>trees[i]</code> with <code>trees[j]</code>.</li>\n\t<li>Remove <code>trees[j]</code> from <code>trees</code>.</li>\n</ul>\n\n<p>Return<em> the <strong>root</strong> of the resulting BST if it is possible to form a valid BST after performing </em><code>n - 1</code><em> operations, or</em><em> </em><code>null</code> <i>if it is impossible to create a valid BST</i>.</p>\n\n<p>A BST (binary search tree) is a binary tree where each node satisfies the following property:</p>\n\n<ul>\n\t<li>Every node in the node's left subtree has a value <strong>strictly less</strong> than the node's value.</li>\n\t<li>Every node in the node's right subtree has a value <strong>strictly greater</strong> than the node's value.</li>\n</ul>\n\n<p>A leaf is a node that has no children.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/06/08/d1.png\" style=\"width: 450px; height: 163px;\" />\n<pre>\n<strong>Input:</strong> trees = [[2,1],[3,2,5],[5,4]]\n<strong>Output:</strong> [3,2,5,1,null,4]\n<strong>Explanation:</strong>\nIn the first operation, pick i=1 and j=0, and merge trees[0] into trees[1].\nDelete trees[0], so trees = [[3,2,5,1],[5,4]].\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/06/24/diagram.png\" style=\"width: 450px; height: 181px;\" />\nIn the second operation, pick i=0 and j=1, and merge trees[1] into trees[0].\nDelete trees[1], so trees = [[3,2,5,1,null,4]].\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/06/24/diagram-2.png\" style=\"width: 220px; height: 165px;\" />\nThe resulting tree, shown above, is a valid BST, so return its root.</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/06/08/d2.png\" style=\"width: 450px; height: 171px;\" />\n<pre>\n<strong>Input:</strong> trees = [[5,3,8],[3,2,6]]\n<strong>Output:</strong> []\n<strong>Explanation:</strong>\nPick i=0 and j=1 and merge trees[1] into trees[0].\nDelete trees[1], so trees = [[5,3,8,2,6]].\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/06/24/diagram-3.png\" style=\"width: 240px; height: 196px;\" />\nThe resulting tree is shown above. This is the only valid operation that can be performed, but the resulting tree is not a valid BST, so return null.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/06/08/d3.png\" style=\"width: 430px; height: 168px;\" />\n<pre>\n<strong>Input:</strong> trees = [[5,4],[3]]\n<strong>Output:</strong> []\n<strong>Explanation:</strong> It is impossible to perform any operations.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == trees.length</code></li>\n\t<li><code>1 <= n <= 5 * 10<sup>4</sup></code></li>\n\t<li>The number of nodes in each tree is in the range <code>[1, 3]</code>.</li>\n\t<li>Each node in the input may have children but no grandchildren.</li>\n\t<li>No two roots of <code>trees</code> have the same value.</li>\n\t<li>All the trees in the input are <strong>valid BSTs</strong>.</li>\n\t<li><code>1 <= TreeNode.val <= 5 * 10<sup>4</sup></code>.</li>\n</ul>\n",
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"code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n * public int val;\n * public TreeNode left;\n * public TreeNode right;\n * public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {\n * this.val = val;\n * this.left = left;\n * this.right = right;\n * }\n * }\n */\npublic class Solution {\n public TreeNode CanMerge(IList<TreeNode> trees) {\n \n }\n}",
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"code": "# Definition for a binary tree node.\n# class TreeNode\n# attr_accessor :val, :left, :right\n# def initialize(val = 0, left = nil, right = nil)\n# @val = val\n# @left = left\n# @right = right\n# end\n# end\n# @param {TreeNode[]} trees\n# @return {TreeNode}\ndef can_merge(trees)\n \nend",
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"code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n * public var val: Int\n * public var left: TreeNode?\n * public var right: TreeNode?\n * public init() { self.val = 0; self.left = nil; self.right = nil; }\n * public init(_ val: Int) { self.val = val; self.left = nil; self.right = nil; }\n * public init(_ val: Int, _ left: TreeNode?, _ right: TreeNode?) {\n * self.val = val\n * self.left = left\n * self.right = right\n * }\n * }\n */\nclass Solution {\n func canMerge(_ trees: [TreeNode?]) -> TreeNode? {\n \n }\n}",
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"code": "/**\n * Example:\n * var ti = TreeNode(5)\n * var v = ti.`val`\n * Definition for a binary tree node.\n * class TreeNode(var `val`: Int) {\n * var left: TreeNode? = null\n * var right: TreeNode? = null\n * }\n */\nclass Solution {\n fun canMerge(trees: List<TreeNode?>): TreeNode? {\n \n }\n}",
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"code": "// Definition for a binary tree node.\n// #[derive(Debug, PartialEq, Eq)]\n// pub struct TreeNode {\n// pub val: i32,\n// pub left: Option<Rc<RefCell<TreeNode>>>,\n// pub right: Option<Rc<RefCell<TreeNode>>>,\n// }\n// \n// impl TreeNode {\n// #[inline]\n// pub fn new(val: i32) -> Self {\n// TreeNode {\n// val,\n// left: None,\n// right: None\n// }\n// }\n// }\nuse std::rc::Rc;\nuse std::cell::RefCell;\nimpl Solution {\n pub fn can_merge(trees: Vec<Option<Rc<RefCell<TreeNode>>>>) -> Option<Rc<RefCell<TreeNode>>> {\n \n }\n}",
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"Is it possible to have multiple leaf nodes with the same values?",
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"How many possible positions are there for each tree?",
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"The root value of the final tree does not occur as a value in any of the leaves of the original tree."
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"adminUrl": null,
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"challengeQuestion": null,
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"__typename": "QuestionNode"
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}
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}
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} |