diff --git a/problems/0031.下一个排列.md b/problems/0031.下一个排列.md
index e0981b61..15941e53 100644
--- a/problems/0031.下一个排列.md
+++ b/problems/0031.下一个排列.md
@@ -162,6 +162,29 @@ class Solution:
             low += 1
             high -= 1
 ```
+>上一版本简化版
+'''python
+class Solution(object):
+    def nextPermutation(self, nums: List[int]) -> None:
+        n = len(nums)
+        i = n-2
+        while i >= 0 and nums[i] >= nums[i+1]:
+            i -= 1
+        
+        if i > -1: // i==-1,不存在下一个更大的排列
+            j = n-1
+            while j >= 0 and nums[j] <= nums[i]:
+                j -= 1
+            nums[i], nums[j] = nums[j], nums[i]
+
+        start, end = i+1, n-1
+        while start < end:
+            nums[start], nums[end] = nums[end], nums[start]
+            start += 1
+            end -= 1
+        
+        return nums
+'''
 
 ## Go