save project

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_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
-
-
+import random
+alist=[]
+for i in range(1,101):
+    alist.append(i)
+num=random.choice(alist)
 def bs(alist,num):
 def bs(alist,num):
     low=0
     low=0
     high=len(alist)-1
     high=len(alist)-1
-    guess=21
+
     while low<=high :
     while low<=high :
         mid=(low+high)//2
         mid=(low+high)//2
-        num=alist[mid]
+        guess=alist[mid]
         if guess==num:
         if guess==num:
-            print('找到了'+str(guess)+"索引位是：",mid)
-            break
+            return mid
         elif guess<num:
         elif guess<num:
             high=mid-1
             high=mid-1
         else:
         else:
             low= mid+1
             low= mid+1
-result=bs(num_list,21)
+result=bs(alist,num)
+print(num)
 print(result)
 print(result)
+