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]
+nas = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+high=9
+mid=(high+low)//2
+guess=20
+while True:
+    if nas[mid] == 20:
+        print('20在列表里面的索引是',mid,'，列表里没有9')
+        exit()
+    elif nas[mid]<guess:
+        low=mid+1
+        mid=(low+high)//2 
+    elif nas[mid]>guess:
+        high=mid-1
+        mid=(low+high)//2 
\ No newline at end of file