计算分数加减表达式的值

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	祝福	27ms	6.2 MiB	C++14(O2)	249 Bytes	2025-1-18 10:26:04
AC	黄奕杰	27ms	6 MiB	C++14(O2)	255 Bytes	2024-10-2 19:00:23
AC	方一帆	29ms	6 MiB	C++14(O2)	255 Bytes	2024-8-31 17:20:58
AC	刘兵	29ms	6.1 MiB	C++14(O2)	253 Bytes	2024-9-11 16:32:28
AC	刘恒嘉	31ms	6 MiB	C++14(O2)	285 Bytes	2024-9-24 20:56:09