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@@ -9,7 +9,7 @@
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> 构造二叉搜索树,一不小心就平衡了
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## 108.将有序数组转换为二叉搜索树
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# 108.将有序数组转换为二叉搜索树
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[力扣题目链接](https://leetcode-cn.com/problems/convert-sorted-array-to-binary-search-tree/)
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@@ -21,7 +21,7 @@
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## 思路
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# 思路
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做这道题目之前大家可以了解一下这几道:
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@@ -192,7 +192,7 @@ public:
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};
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```
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## 总结
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# 总结
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**在[二叉树:构造二叉树登场!](https://programmercarl.com/0106.从中序与后序遍历序列构造二叉树.html) 和 [二叉树:构造一棵最大的二叉树](https://programmercarl.com/0654.最大二叉树.html)之后,我们顺理成章的应该构造一下二叉搜索树了,一不小心还是一棵平衡二叉搜索树**。
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@@ -205,10 +205,10 @@ public:
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最后依然给出迭代的方法,其实就是模拟取中间元素,然后不断分割去构造二叉树的过程。
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## 其他语言版本
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# 其他语言版本
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Java:
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## Java
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递归: 左闭右开 [left,right)
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```Java
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@@ -253,7 +253,8 @@ class Solution {
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return root;
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}
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}
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```
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```
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迭代: 左闭右闭 [left,right]
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```java
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class Solution {
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@@ -303,15 +304,10 @@ class Solution {
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}
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```
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Python:
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## Python
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递归法:
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```python3
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# Definition for a binary tree node.
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# class TreeNode:
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# def __init__(self, val=0, left=None, right=None):
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# self.val = val
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# self.left = left
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# self.right = right
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#递归法
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class Solution:
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def sortedArrayToBST(self, nums: List[int]) -> TreeNode:
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def buildaTree(left,right):
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@@ -326,21 +322,11 @@ class Solution:
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return root
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```
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Go:
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## Go
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> 递归(隐含回溯)
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递归(隐含回溯)
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```go
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/**
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* Definition for a binary tree node.
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* type TreeNode struct {
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* Val int
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* Left *TreeNode
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* Right *TreeNode
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* }
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*/
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//递归(隐含回溯)
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func sortedArrayToBST(nums []int) *TreeNode {
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if len(nums)==0{return nil}//终止条件,最后数组为空则可以返回
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root:=&TreeNode{nums[len(nums)/2],nil,nil}//按照BSL的特点,从中间构造节点
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@@ -350,21 +336,9 @@ func sortedArrayToBST(nums []int) *TreeNode {
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}
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```
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JavaScript版本
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## JavaScript
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```javascript
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/**
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* Definition for a binary tree node.
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* function TreeNode(val, left, right) {
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* this.val = (val===undefined ? 0 : val)
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* this.left = (left===undefined ? null : left)
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* this.right = (right===undefined ? null : right)
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* }
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*/
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/**
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* @param {number[]} nums
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* @return {TreeNode}
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*/
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var sortedArrayToBST = function (nums) {
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const buildTree = (Arr, left, right) => {
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if (left > right)
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