diff --git a/problems/1005.K次取反后最大化的数组和.md b/problems/1005.K次取反后最大化的数组和.md
index 5539aff8..387de147 100644
--- a/problems/1005.K次取反后最大化的数组和.md
+++ b/problems/1005.K次取反后最大化的数组和.md
@@ -133,7 +133,7 @@ class Solution:
                 A[i] *= -1
                 K -= 1
         if K > 0:
-            A[len(A) - 1] *= ((-1)**K)
+            A[-1] *= (-1)**K #取A最后一个数只需要写-1
         return sum(A)
 ```