spfa判断负环

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	Csvoner	34ms	6.7 MiB	C++14(O2)	1.2 KiB	2024-6-18 18:24:55
AC	666ahhjon	50ms	6.7 MiB	C++14(O2)	724 Bytes	2026-10-5 10:29:16
AC	Ayin	51ms	6.7 MiB	C++14(O2)	632 Bytes	2026-10-6 16:47:59
AC	我是拉普兰德的狗	53ms	6.7 MiB	C++14(O2)	890 Bytes	2026-10-5 11:24:36
AC	张秦鲁	53ms	6.7 MiB	C++14(O2)	820 Bytes	2026-10-5 11:54:44
AC	Candy-Three	55ms	6.7 MiB	C++14(O2)	770 Bytes	2026-10-5 11:24:11
AC	PomeloGPT	72ms	6.7 MiB	C++14(O2)	1.6 KiB	2026-10-5 12:07:04
AC	李泽瑞	109ms	6.7 MiB	C++14(O2)	885 Bytes	2026-10-5 11:21:03