【二分3】找前驱后继问题

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	CodeFun186014ff3e	1423ms	6.9 MiB	C++98	1.9 KiB	2025-5-3 1:07:16
AC	CodeFun59f348eee8	1439ms	7 MiB	C++11	1 KiB	2025-5-21 20:06:24
AC	CodeFune0b70bed38	1453ms	17.8 MiB	Python 3	815 Bytes	2025-8-3 7:03:13
AC	CodeFunc4b98ffac1	1466ms	7 MiB	C++98	858 Bytes	2025-5-14 15:56:20
AC	CodeFun319e0cda7c	1488ms	7.5 MiB	C++11	1.2 KiB	2025-4-16 17:40:26
AC	qfnIlNAfJR	1591ms	6.7 MiB	C++17(O2)	1.1 KiB	2026-4-21 9:46:30
AC	No Confusion	1669ms	6.6 MiB	C++17(O2)	1 KiB	2026-4-21 10:29:06
AC	CodeFun67c93d4794	2478ms	7 MiB	C++17(O2)	1.4 KiB	2025-11-9 6:51:44
AC	bBtRJ8GkCw	5250ms	14.9 MiB	Python 3	611 Bytes	2026-9-2 11:36:39