Convert Sorted Array to Binary Search Tree leetcode java

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Convert Sorted Array to Binary Search Tree leetcode java

题目: Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 题解: 先复习下什么是二叉搜索树(引自Wikipedia): 二叉查找树(Binary Search Tree),也称有序二叉树(ordered binary tree),排序二叉树(sorted binary tree),是指一棵空树或者具有下列性质的二叉树: 若任意节点的左子树不空,则左子树…

Convert Sorted List to Binary Search Tree leetcode java

题目: Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 题解: 之前做过一道是从sorted array转换到BinarySearchTree的,方法还是一样二分法.但是构造树的方法不是由顶至下了,是要由低至上的建立. 代码如下: ListNode temp = head; …

Convert Sorted Array to Binary Search Tree——LeetCode

Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 题目大意:给定一个升序序列的数组,将其转换为二叉搜索树. 解题思路:数组中间元素是根元素,根元素将数组划分为两部分,两个部分的中心元素分别为根元素的左右孩子,依次递推...可用迭代或递归来做. 解法一(迭代):迭代需要自己额外记录下标 public TreeNode sortedArrayToBST(i…

Convert Sorted Array to Binary Search Tree || LeetCode

/** * Definition for a binary tree node. * struct TreeNode { * int val; * struct TreeNode *left; * struct TreeNode *right; * }; */ struct TreeNode* built_bst(int* nums,int start,int end){ int mid; mid=(start+end)/2; if(start>end)return NULL; struct T…

LeetCode算法题-Convert Sorted Array to Binary Search Tree（Java实现）

这是悦乐书的第166次更新,第168篇原创 01 看题和准备今天介绍的是LeetCode算法题中Easy级别的第25题(顺位题号是108).给定一个数组,其中元素按升序排序,将其转换为高度平衡的二叉搜索树.例如: 给定排序数组:[ -10,-3, 0, 5, 9] 一个可能的答案是:[0,-3, 9,-10,null,5],它代表以下高度平衡的二叉搜索树: 0 / \ -3 9 / / -10 5 本次解题使用的开发工具是eclipse,jdk使用的版本是1.8,环境是win7 64位系统,使…

【LeetCode OJ】Convert Sorted Array to Binary Search Tree

Problem Link: http://oj.leetcode.com/problems/convert-sorted-array-to-binary-search-tree/ Same idea to Convert Sorted Array to Binary Search Tree, but we use a recursive function to construct the binary search tree. # Definition for a binary tree nod…

LeetCode:Convert Sorted Array to Binary Search Tree,Convert Sorted List to Binary Search Tree

LeetCode:Convert Sorted Array to Binary Search Tree Given an array where elements are sorted in ascending order, convert it to a height balanced BST 分析:找到数组的中间数据作为根节点,小于中间数据的数组来构造作为左子树,大于中间数据的数组来构造右子树,递归解法如下 /** * Definition for binary tree * struct…

LeetCode 108. 将有序数组转换为二叉搜索树(Convert Sorted Array to Binary Search Tree) 14

108. 将有序数组转换为二叉搜索树 108. Convert Sorted Array to Binary Search Tree 题目描述将一个按照升序排列的有序数组,转换为一棵高度平衡二叉搜索树. 本题中,一个高度平衡二叉树是指一个二叉树每个节点的左右两个子树的高度差的绝对值不超过 1. 每日一算法2019/5/17Day 14LeetCode108. Convert Sorted Array to Binary Search Tree 示例: 给定有序数组: [-10,-3,0,5,9…

[Leetcode][JAVA] Convert Sorted Array to Binary Search Tree && Convert Sorted List to Binary Search Tree

Convert Sorted Array to Binary Search Tree Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 很简单的二分法,只要给出Array的开始和结束下标作为参数传入即可. public TreeNode sortedArrayToBST(int[] num) { return constructBST(num,0,nu…

【leetcode】Convert Sorted Array to Binary Search Tree

Convert Sorted Array to Binary Search Tree Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 每次把中间元素当成根节点,递归即可 /** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * Tre…