给你一棵二叉搜索树，请你返回一棵 平衡后 的二叉搜索树，新生成的树应该与原来的树有着相同的节点值。如果有多种构造方法，请你返回任意一种。 如果一棵二叉搜索树中，每个节点的两棵子树高度差不超过 1 ，我们就称这棵二叉搜索树是 平衡的 。   示例 1： 输入：root = [1,null,2,null,3,null,4,null,null] 输出：[2,1,3,null,null,null,4] 解释：这不是唯一的正确答案，[3,1,4,null,2,null,null] 也是一个可行的构造方案。 示例 2：…

Given the root of a binary search tree, return a balanced binary search tree with the same node values. If there is more than one answer, return any of them. A binary search tree is balanced if the depth of the two subtrees of every node never differs by…

给出一棵二叉树，其上每个结点的值都是 0 或 1 。每一条从根到叶的路径都代表一个从最高有效位开始的二进制数。

You are given the root of a binary tree where each node has a value 0 or 1. Each root-to-leaf path represents a binary number starting with the most significant bit.

给你一个二维整数数组 descriptions ，其中 descriptions[i] = [parenti, childi, isLefti] 表示 parenti 是 childi 在 二叉树 中的 父节点，二叉树中各节点的值 互不相同 。此外：

You are given a 2D integer array descriptions where descriptions[i] = [parenti, childi, isLefti] indicates that parenti is the parent of childi in a binary tree of unique values. Furthermore,

给你一棵 n 个节点的无向树，节点从 1 到 n 编号，树以节点 1 为根。树由一个长度为 n - 1 的二维整数数组 edges 表示，其中 edges[i] = [ui, vi] 表示在节点 ui 和 vi 之间有一条边。

There is an undirected tree with n nodes labeled from 1 to n, rooted at node 1. The tree is represented by a 2D integer array edges of length n - 1, where edges[i] = [ui, vi] indicates that there is an edge between nodes ui and vi. Initially, all edges have…

给你一棵有 n 个节点的无向树，节点从 1 到 n 编号，树以节点 1 为根。树由一个长度为 n - 1 的二维整数数组 edges 表示，其中 edges[i] = [ui, vi] 表示在节点 ui 和 vi 之间有一条边。

There is an undirected tree with n nodes labeled from 1 to n, rooted at node 1. The tree is represented by a 2D integer array edges of length n - 1, where edges[i] = [ui, vi] indicates that there is an edge between nodes ui and vi. Initially, all edges have…