auto save

my_search.py

@@ -3,7 +3,23 @@ import random
 alist = []
 alist = []
 for i in range(1, 101):
 for i in range(1, 101):
     alist.append(i)
     alist.append(i)
-num = random.choice(alist)
+hidenum = 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,hidenum):
\ No newline at end of file
+    low = 0
+    higt = len(alist) - 1
+    while low <= higt:
+        mid = (low+higt) // 2     #mid = 5
+        gusse = alist[mid]     #guess=11
+        if gusse == hidenum:
+           return mid
+        elif gusse < hidenum:
+            low = mid+1
+        elif gusse > hidenum:
+            higt = mid-1
+    return None
+
+ok = binary_search(alist,hidenum)
+print('老师给的数为，',hidenum)
+print('索引为，',ok)
\ No newline at end of file