save project

1.py

+# 使用二分查找法，找出9和20在列表里面的索引
+bingo_num=17
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low = 0
+hight=len(num_list)-1
+while low<=hight:
+    mid=(low+hight)//2
+    guess_num=num_list[mid]
+    if guess_num==bingo_num:
+        print("找到了：",mid)
+        break
+    elif guess_num<bingo_num:
+        low=mid+1
+    elif guess_num>bingo_num:
+        hight=mid-1
+    else:
+        print("没有")
\ No newline at end of file

my_search.py

@@ -6,4 +6,19 @@ for i in range(1, 101):
 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 binary_search(alist,num):
\ No newline at end of file
+def binary_search(alist,num):
+    low = 0
+    hight=len(alist)-1
+    while low<=hight:
+        mid=(low+hight)//2
+        guess=alist[mid]
+        if guess==num:
+            return mid
+        elif guess<num:
+            low=mid+1
+        elif guess>num:
+            hight=mid-1
+    return None
+resulc=binary_search(alist,num)
+print("老师给的:",num)
+print("列表索引:",resulc)
\ No newline at end of file