Update 0053.最大子序和.md

problems/0053.最大子序和.md

@@ -198,21 +198,35 @@ class Solution {
 ```
 
 ### Python
-
+暴力法
 ```python
 class Solution:
-    def maxSubArray(self, nums: List[int]) -> int:
-        result = -float('inf')
+    def maxSubArray(self, nums):
+        result = float('-inf')  # 初始化结果为负无穷大
+        count = 0
+        for i in range(len(nums)):  # 设置起始位置
+            count = 0
+            for j in range(i, len(nums)):  # 从起始位置i开始遍历寻找最大值
+                count += nums[j]
+                result = max(count, result)  # 更新最大值
+        return result
+
+```
+```python
+class Solution:
+    def maxSubArray(self, nums):
+        result = float('-inf')  # 初始化结果为负无穷大
         count = 0
         for i in range(len(nums)):
             count += nums[i]
-            if count > result:
+            if count > result:  # 取区间累计的最大值（相当于不断确定最大子序终止位置）
                 result = count
-            if count <= 0:
+            if count <= 0:  # 相当于重置最大子序起始位置，因为遇到负数一定是拉低总和
                 count = 0
         return result
-```
 
+
+```
 ### Go
 
 ```go