save project

1.py

+# 使用二分查找法，找出9和20在列表里面的索引
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+num=9
+high=len(num_list)-1
+
+def 
+    while low<=high:
+        mid=(low+high)//2
+        guss1=num_list[mid]
+        if num==guss1 :
+            print(num)
+            break
+        elif num>guss1:
+            low=mid+1
+        else:
+            high=mid-1
+    return None
\ No newline at end of file

my_search.py

@@ -7,3 +7,17 @@ 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
 # 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 binary_search(alist,num):
 def binary_search(alist,num):
+    low=0
+    high=len(alist)-1
+    while low<=high:
+        mid=(low+high)//2
+        guess=alist[mid]
+        if num==guess :
+            print(num)
+            break
+        elif num>guess:
+            low=mid+1
+        else:
+            high=mid-1
+    return None
+binary_search(alist,num)