【例23.3】简单计算器

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	bowenzhang	21ms	528 KiB	C++20(O2)	298 Bytes	2025-12-15 16:29:36
AC	jerryhu	22ms	548 KiB	C++98	359 Bytes	2025-12-13 14:12:17
AC	reginazhang	23ms	548 KiB	C++20(O2)	384 Bytes	2025-12-13 9:50:24
AC	vionazhang	23ms	552 KiB	C++98	308 Bytes	2025-12-14 16:55:20
AC	hankli	23ms	592 KiB	C++20	302 Bytes	2025-9-28 13:26:09
AC	stevexiong	23ms	552 KiB	C++98	638 Bytes	2025-10-4 10:50:04
AC	raycao	24ms	548 KiB	C++20(O2)	352 Bytes	2025-9-26 18:31:16
AC	peterwei	26ms	548 KiB	C++20(O2)	380 Bytes	2025-12-18 1:13:16