diff --git a/problems/0704.二分查找.md b/problems/0704.二分查找.md
index 66be52a0..caec38b1 100644
--- a/problems/0704.二分查找.md
+++ b/problems/0704.二分查找.md
@@ -337,7 +337,7 @@ end
 # （版本二）左闭右开区间
 
 def search(nums, target)
-  left, right = 0, nums.length - 1
+  left, right = 0, nums.length
   while left < right	# 由于定义target在一个在左闭右开的区间里，因此极限情况下right=left+1
     middle = (left + right) / 2
     if nums[middle] > target