save project

my_search.py

 import random
 import random
 
 
-alist = []
-for i in range(1, 101):
-    alist.append(i)
+alist = [i for i in range(0, 101)]
 num = random.choice(alist)
 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):
+    i=0
+    j=len(alist)-1
+    print('目标值')
+    while i<=j:
+        mid=(i+j)//2
+        if mid==num:
+            return mid
+        elif mid<num:
+            i=mid+1
+        else:
+            j=mid-1
+        print('当前值'+str(mid))
+    return None
+print(binary_search(alist,num))
+
+    
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