auto save

DIY2.PY

+import random
+alist=[]
+for i in range(1,100)
+    alist.append(i)
+num=random.choice(alist)
+def binary_sectch(alist,num):
+    low=0
+    high=len(alist)-1
+    while low<=high:
+        mid=(low+high)//2
+        guess=alist[mid]
+        if guess==num：
+            return mid
+        elif guess<num:
+            low=mid+1
+        else:
+            high=mid+1
+    return None
+result=binary_sectch(alist,num)
+print("老师给的数量:",num)
+print("它在列表里的索引是：",result)

binary_search.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]
\ No newline at end of file
+bingo_num=20# 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
+high=len(num_list)-1
+while low<high:
+    mid=(low+high)//2
+    guess_num=num_list[mid]
+    if guess_num==bingo_num:
+        print('找到了，它在列表中的索引是：',mid)
+        break
+    elif guess_num<bingo_num:
+        low=mid+1
+    elif guess_num>bingo_num:
+        low=mid-1