【例3.1】输出表达式的值

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	姚胜蓝	2ms	504 KiB	C++14(O2)	142 Bytes	2025-7-4 8:18:09
AC	shtian	2ms	536 KiB	C++98	159 Bytes	2024-7-10 20:37:40
AC	纪隆宇	2ms	488 KiB	C++14	129 Bytes	2025-6-27 21:05:53
AC	string_dbr	2ms	504 KiB	C++14(O2)	325 Bytes	2025-5-26 14:31:19
AC	_chjich_	2ms	324 KiB	C++14(O2)	112 Bytes	2024-7-23 9:07:45
AC	杨锦莲xly2025	3ms	504 KiB	C++14(O2)	111 Bytes	2025-7-13 18:36:40
AC	root	3ms	504 KiB	C++14(O2)	115 Bytes	2025-5-3 8:12:12
AC	gfgg	3ms	504 KiB	C++14(O2)	109 Bytes	2025-5-26 11:08:23
AC	黄昭明xly2025	3ms	504 KiB	C++14(O2)	103 Bytes	2025-7-4 16:30:50
AC	马康智xly2025	3ms	508 KiB	C++14(O2)	113 Bytes	2025-7-7 16:09:23
AC	Oxygen	3ms	504 KiB	C++14	111 Bytes	2025-5-25 17:26:17
AC	丁资凡qcx	3ms	504 KiB	C++14(O2)	107 Bytes	2025-7-13 19:54:05
AC	zhm516888	3ms	504 KiB	C++17(O2)	116 Bytes	2025-7-3 15:55:01
AC	yzh1217	3ms	320 KiB	C++14(O2)	112 Bytes	2024-8-13 16:18:07
AC	wangmingxuan	3ms	324 KiB	C++14(O2)	108 Bytes	2024-8-7 15:22:29
AC	曹磊	3ms	504 KiB	C++14	114 Bytes	2025-5-26 14:33:16
AC	Mch121018	3ms	508 KiB	C++14(O2)	110 Bytes	2025-7-4 14:14:10
AC	heqianyu	3ms	324 KiB	C++14(O2)	149 Bytes	2024-7-20 15:54:21
AC	BRO	3ms	768 KiB	C++98	115 Bytes	2024-7-8 23:17:27