【二分1】查询是否存在某个数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	CodeFunb10eb0db9e	1071ms	7.1 MiB	C++11	953 Bytes	2025-8-29 10:28:26
AC	CodeFun57fb1ccaea	1161ms	7 MiB	C++17(O2)	979 Bytes	2025-10-24 23:43:46
AC	CodeFun7efe9b04f7	1379ms	7.1 MiB	C++98	775 Bytes	2025-9-5 9:20:03
AC	CodeFun5615a42695	1381ms	7 MiB	C++98	927 Bytes	2025-7-16 22:49:39
AC	CodeFunffd0061b36	1881ms	6.7 MiB	C++11	492 Bytes	2025-3-18 22:37:55
AC	CodeFunf95afe31c5	2359ms	6.6 MiB	C++98	871 Bytes	2025-3-14 6:41:52
AC	CodeFun715b702dcd	2676ms	6.5 MiB	C++17	788 Bytes	2025-2-27 23:43:11