最大逆序对和

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	Csvoner	78ms	6.5 MiB	C++14(O2)	451 Bytes	2025-1-2 22:14:07
AC	LHY	231ms	6.5 MiB	C++14(O2)	508 Bytes	2025-1-4 20:22:40
AC	xixiao	275ms	6.5 MiB	C++14(O2)	284 Bytes	2025-1-8 16:39:51
AC	CBH37	369ms	6.5 MiB	C++14(O2)	1.9 KiB	2025-1-5 1:19:46