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]
+a= [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+start=0
+end=9
+mid=(start+end)//2
+guss=3
+while True:
+    if guss == a[mid]:
+        print("找到了",guss)
+        break
+    if guss > a[mid]:
+        start=a[mid]+1
+    if guss < a[mid]:
+        end=mid-1
+    if start > end:
+        print("不存在")
+        break
+    mid=(start+end)//2
\ No newline at end of file