【例23.3】简单计算器

状态	递交者	时间	内存	语言	代码	递交时间
AC	UID 18	12ms	512 KiB	C++20(O2)	577 Bytes	2026-8-12 11:47:54
AC	UID 301	13ms	768 KiB	C++20(O2)	361 Bytes	2026-8-12 11:51:23
AC	UID 23	13ms	520 KiB	C++20(O2)	368 Bytes	2026-8-12 11:53:07
AC	wyh	14ms	504 KiB	C++98	344 Bytes	2025-7-19 14:04:14
AC	许铖晟	14ms	504 KiB	C++98	367 Bytes	2025-7-17 8:22:23
AC	李屹则	14ms	760 KiB	C++98	614 Bytes	2025-12-7 20:33:38