auto save

binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
 # 使用二分查找法，找出9和20在列表里面的索引
-num = 1
+num = 4
 
 
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 
 
@@ -16,3 +16,7 @@ while low <= high:
     else:
     else:
         high = mid - 1
         high = mid - 1
 
 
+
+if high < low:
+    print("不存在")
+        
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