{ "data": { "question": { "questionId": "1450", "questionFrontendId": "1325", "categoryTitle": "Algorithms", "boundTopicId": 74730, "title": "Delete Leaves With a Given Value", "titleSlug": "delete-leaves-with-a-given-value", "content": "

Given a binary tree root and an integer target, delete all the leaf nodes with value target.

\n\n

Note that once you delete a leaf node with value target, if its parent node becomes a leaf node and has the value target, it should also be deleted (you need to continue doing that until you cannot).

\n\n

 

\n

Example 1:

\n\n

\"\"

\n\n
\nInput: root = [1,2,3,2,null,2,4], target = 2\nOutput: [1,null,3,null,4]\nExplanation: Leaf nodes in green with value (target = 2) are removed (Picture in left). \nAfter removing, new nodes become leaf nodes with value (target = 2) (Picture in center).\n
\n\n

Example 2:

\n\n

\"\"

\n\n
\nInput: root = [1,3,3,3,2], target = 3\nOutput: [1,3,null,null,2]\n
\n\n

Example 3:

\n\n

\"\"

\n\n
\nInput: root = [1,2,null,2,null,2], target = 2\nOutput: [1]\nExplanation: Leaf nodes in green with value (target = 2) are removed at each step.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "删除给定值的叶子节点", "translatedContent": "

给你一棵以 root 为根的二叉树和一个整数 target ，请你删除所有值为 target 的 叶子节点 。

\n\n

注意，一旦删除值为 target 的叶子节点，它的父节点就可能变成叶子节点；如果新叶子节点的值恰好也是 target ，那么这个节点也应该被删除。

\n\n

也就是说，你需要重复此过程直到不能继续删除。

\n\n

 

\n\n

示例 1：

\n\n

\"\"

\n\n
输入：root = [1,2,3,2,null,2,4], target = 2\n输出：[1,null,3,null,4]\n解释：\n上面左边的图中，绿色节点为叶子节点，且它们的值与 target 相同（同为 2 ），它们会被删除，得到中间的图。\n有一个新的节点变成了叶子节点且它的值与 target 相同，所以将再次进行删除，从而得到最右边的图。\n
\n\n

示例 2：

\n\n

\"\"

\n\n
输入：root = [1,3,3,3,2], target = 3\n输出：[1,3,null,null,2]\n
\n\n

示例 3：

\n\n

\"\"

\n\n
输入：root = [1,2,null,2,null,2], target = 2\n输出：[1]\n解释：每一步都删除一个绿色的叶子节点（值为 2）。
\n\n

示例 4：

\n\n
输入：root = [1,1,1], target = 1\n输出：[]\n
\n\n

示例 5：

\n\n
输入：root = [1,2,3], target = 1\n输出：[1,2,3]\n
\n\n

 

\n\n

提示：

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0 : val)\n * this.left = (left===undefined ? null : left)\n * this.right = (right===undefined ? null : right)\n * }\n */\n/**\n * @param {TreeNode} root\n * @param {number} target\n * @return {TreeNode}\n */\nvar removeLeafNodes = function(root, target) {\n\n};", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "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} root\n# @param {Integer} target\n# @return {TreeNode}\ndef remove_leaf_nodes(root, target)\n\nend", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "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 removeLeafNodes(_ root: TreeNode?, _ target: Int) -> TreeNode? {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "/**\n * Definition for a binary tree node.\n * type TreeNode struct {\n * Val int\n * Left *TreeNode\n * Right *TreeNode\n * }\n */\nfunc removeLeafNodes(root *TreeNode, target int) *TreeNode {\n\n}", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "/**\n * Definition for a binary tree node.\n * class TreeNode(_value: Int = 0, _left: TreeNode = null, _right: TreeNode = null) {\n * var value: Int = _value\n * var left: TreeNode = _left\n * var right: TreeNode = _right\n * }\n */\nobject Solution {\n def removeLeafNodes(root: TreeNode, target: Int): TreeNode = {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "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 removeLeafNodes(root: TreeNode?, target: Int): TreeNode? {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "// Definition for a binary tree node.\n// #[derive(Debug, PartialEq, Eq)]\n// pub struct TreeNode {\n// pub val: i32,\n// pub left: Option>>,\n// pub right: Option>>,\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 remove_leaf_nodes(root: Option>>, target: i32) -> Option>> {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "/**\n * Definition for a binary tree node.\n * class TreeNode {\n * public $val = null;\n * public $left = null;\n * public $right = null;\n * function __construct($val = 0, $left = null, $right = null) {\n * $this->val = $val;\n * $this->left = $left;\n * $this->right = $right;\n * }\n * }\n */\nclass Solution {\n\n /**\n * @param TreeNode $root\n * @param Integer $target\n * @return TreeNode\n */\n function removeLeafNodes($root, $target) {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "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 removeLeafNodes(root: TreeNode | null, target: number): TreeNode | null {\n\n};", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "; Definition for a binary tree node.\n#|\n\n; val : integer?\n; left : (or/c tree-node? #f)\n; right : (or/c tree-node? #f)\n(struct tree-node\n (val left right) #:mutable #:transparent)\n\n; constructor\n(define (make-tree-node [val 0])\n (tree-node val #f #f))\n\n|#\n\n(define/contract (remove-leaf-nodes root target)\n (-> (or/c tree-node? #f) exact-integer? 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