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
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+high=9
+a=int(input())
+while (1):
+    mid=(low+high)//2
+    if num_list[mid]==a:
+        print(mid)
+        break
+    elif num_list[mid]<a:
+        low=mid+1
+    elif num_list[mid]>a:
+        high=mid-1
+    if high<=low:
+        print("没")
+        break