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]
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+zuidi=0
+zuigao=len(num_list)-1
+num=20
+while zuidi<=zuigao:
+    mid=(zuidi+zuigao)//2
+    guess=num_list[mid]
+    if guess==num:
+        print("找到了",mid)
+        break
+    elif guess<num:
+        zuidi=mid+1
+    else:
+        zuigao=mid-1
+
+
+