修复python在md中的语法高亮&代码格式调整

problems/0209.长度最小的子数组.md

@@ -181,23 +181,23 @@ class Solution:
                 index += 1
         return 0 if res==float("inf") else res
 ```
-```python3
-#滑动窗口
+```python
+# 滑动窗口
 class Solution:
     def minSubArrayLen(self, target: int, nums: List[int]) -> int:
-        if nums is None or len(nums)==0: 
+        if nums is None or len(nums) == 0: 
             return 0 
-        lenf=len(nums)+1
-        total=0
-        i=j=0
-        while (j<len(nums)):
-            total=total+nums[j]
-            j+=1
-            while (total>=target):
-                lenf=min(lenf,j-i)
-                total=total-nums[i]
-                i+=1
-        if lenf==len(nums)+1:
+        lenf = len(nums) + 1
+        total = 0
+        i = j = 0
+        while (j < len(nums)):
+            total = total + nums[j]
+            j += 1
+            while (total >= target):
+                lenf = min(lenf, j - i)
+                total = total - nums[i]
+                i += 1
+        if lenf == len(nums) + 1:
             return 0
         else: 
             return lenf