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
+n=int(input())
+l=0
+h=len(num_list)-1
+while True:
+    c=(l+h)//2
+    if num_list[c-1]<n:
+        l=c+1
+    else:
+        h=c-1
+    if num_list[c]==n:
+        print(c)
+        break
+    elif h<l:
+        break
\ No newline at end of file