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
+a=0
+b=len(num_list)-1
+mid=(a+b)//2
+while True:
+    mid=(a+b)//2
+    if num_list[mid] == 20: # num_list[mid] == 9:
+        print("找到了")
+        break
+    elif b<a:
+        print("meiyou")
+        break
+    elif num_list[mid]<20: # num_list[mid]<9:
+        a=mid+1
+    else:
+        b=mid-1