计算分数加减表达式的值

Status	Submit By	Time	Memory	Code	Submit At
AC	CC20260060	31ms	696 KiB	231 Bytes	2023-11-12 8:40:13
AC	BC20260080	40ms	804 KiB	268 Bytes	2024-4-14 15:24:08
AC	BC20260085	40ms	844 KiB	287 Bytes	2024-5-17 14:05:52
AC	BC20260030	41ms	804 KiB	287 Bytes	2024-4-14 20:43:48
AC	C20250070	43ms	696 KiB	247 Bytes	2024-5-18 11:48:09