练8.2 完成习题

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	string_dbr	15ms	504 KiB	C++14(O2)	138 Bytes	2025-5-26 15:05:17
AC	史子友	15ms	760 KiB	C++14(O2)	107 Bytes	2025-10-31 10:54:43
AC	周天心qcx	15ms	760 KiB	C++14(O2)	119 Bytes	2025-7-8 10:11:00
AC	tianlangyufirst	15ms	760 KiB	C++14(O2)	138 Bytes	2025-7-7 15:44:47
AC	chenqiugu	15ms	504 KiB	C++14	137 Bytes	2025-7-27 22:04:36
AC	胡知鱼	15ms	760 KiB	C++14(O2)	140 Bytes	2025-9-20 17:00:05
AC	马康智xly2025	15ms	508 KiB	C++14(O2)	117 Bytes	2025-8-8 19:24:19
AC	杨晨希xly2025	15ms	508 KiB	C++14(O2)	146 Bytes	2025-7-4 16:28:04
AC	惠文奕xly2025	15ms	508 KiB	C++14(O2)	154 Bytes	2025-7-4 18:55:48
AC	w20120404	16ms	504 KiB	C++14(O2)	112 Bytes	2025-7-28 13:04:48