save project

my_search.py

@@ -7,19 +7,19 @@ num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
 def a(alist,num):
-    # 使用二分查找法，找出9和20在列表里面的索引
-    zhaode=int(input("请输入你要找的数:"))
-    num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+
     min=0
-    max=len(num_list)-1
+    max=len(alist)-1
     while min<=max:
         mid=(min+max)//2
-        caide=num_list[mid]
-        if caide==zhaode:
+        caide=alist[mid]
+        if caide==num:
             return mid
-        elif caide<zhaode:
+        elif caide<num:
             min=mid+1
-        elif caide>zhaode:
+        else:
             max=mid-1
     return None
-B
\ No newline at end of file
+B=a(alist,num)
+print("老师给的数是",num)
+print("他在列表里的索引是",B)
\ No newline at end of file