Merge pull request #224 from jojoo15/patch-18

添加 0108.将有序数组转换为二叉搜索树 python3版本

problems/0108.将有序数组转换为二叉搜索树.md

@@ -233,7 +233,27 @@ class Solution {
 ```
 
 Python：
-
+```python3
+# Definition for a binary tree node.
+# class TreeNode:
+#     def __init__(self, val=0, left=None, right=None):
+#         self.val = val
+#         self.left = left
+#         self.right = right
+#递归法
+class Solution:
+    def sortedArrayToBST(self, nums: List[int]) -> TreeNode:
+        def buildaTree(left,right):
+            if left > right: return None  #左闭右闭的区间，当区间 left > right的时候，就是空节点,当left = right的时候，不为空
+            mid = left + (right - left) // 2 #保证数据不会越界
+            val = nums[mid]
+            root = TreeNode(val)
+            root.left = buildaTree(left,mid - 1)
+            root.right = buildaTree(mid + 1,right)
+            return root
+        root = buildaTree(0,len(nums) - 1)  #左闭右闭区间
+        return root
+```
 
 Go：
 
@@ -244,4 +264,4 @@ Go：
 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)
 * B站视频：[代码随想录](https://space.bilibili.com/525438321)
 * 知识星球：[代码随想录](https://mp.weixin.qq.com/s/QVF6upVMSbgvZy8lHZS3CQ)
-<div align="center"><img src=../pics/公众号.png width=450 alt=> </img></div>
+<div align="center"><img src=../pics/公众号.png width=450 alt=> </img></div>