Update 0209.长度最小的子数组.md

problems/0209.长度最小的子数组.md

@@ -173,18 +173,44 @@ class Solution {
 Python：
 
 ```python
+（版本一）滑动窗口法
 class Solution:
     def minSubArrayLen(self, s: int, nums: List[int]) -> int:
-        res = float("inf")   # 定义一个无限大的数
-        Sum = 0     # 滑动窗口数值之和
-        i = 0      # 滑动窗口起始位置
-        for j in range(len(nums)):
-            Sum += nums[j]
-            while Sum >= s:
-                res = min(res, j-i+1)
-                Sum -= nums[i]
-                i += 1
-        return 0 if res == float("inf") else res
+        l = len(nums)
+        left = 0
+        right = 0
+        min_len = float('inf')
+        cur_sum = 0 #当前的累加值
+        
+        while right < l:
+            cur_sum += nums[right]
+            
+            while cur_sum >= s: # 当前累加值大于目标值
+                min_len = min(min_len, right - left + 1)
+                cur_sum -= nums[left]
+                left += 1
+            
+            right += 1
+        
+        return min_len if min_len != float('inf') else 0
+```
+
+```python
+（版本二）暴力法
+class Solution:
+    def minSubArrayLen(self, s: int, nums: List[int]) -> int:
+        l = len(nums)
+        min_len = float('inf')
+        
+        for i in range(l):
+            cur_sum = 0
+            for j in range(i, l):
+                cur_sum += nums[j]
+                if cur_sum >= s:
+                    min_len = min(min_len, j - i + 1)
+                    break
+        
+        return min_len if min_len != float('inf') else 0
 ```
 
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