【字符串2】字符串插入问题

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	潇洒的山泉1713	26ms	7.3 MiB	C++	712 Bytes	2026-9-26 23:20:59
AC	温和的歌手	27ms	7.3 MiB	C++	580 Bytes	2026-9-12 14:25:24
AC	细心的少年	27ms	7.3 MiB	C++	843 Bytes	2026-8-27 18:05:39
AC	jokress	27ms	8.4 MiB	C++	455 Bytes	2026-10-14 17:10:58
AC	RELzhWdYf6	27ms	5.9 MiB	C++	633 Bytes	2026-8-22 20:25:37
AC	ezN6b2KJBy	27ms	7.1 MiB	C++17(O2)	848 Bytes	2026-6-24 16:11:28
AC	焱焱123	27ms	7.3 MiB	C++	598 Bytes	2026-10-11 23:10:48
AC	vYbKzE8Tph	27ms	6.8 MiB	C++17(O2)	756 Bytes	2026-6-4 14:42:39
AC	刻苦的伏念	27ms	6.8 MiB	C++14(O2)	594 Bytes	2026-8-28 16:44:53
AC	CodeFun605c0b58dd	27ms	7.4 MiB	C++	624 Bytes	2026-9-16 14:08:32
AC	乐观的柯基	27ms	6.3 MiB	C++	843 Bytes	2026-9-1 19:57:30
AC	细心的海豚1916	27ms	7.3 MiB	C++14(O2)	618 Bytes	2026-9-16 20:07:49
AC	勤劳的小猫4160	27ms	7.3 MiB	C++	755 Bytes	2026-10-8 0:18:26
AC	柳贯一	27ms	7.1 MiB	C++17(O2)	482 Bytes	2026-4-7 18:09:28
AC	好奇的吉他	27ms	6.3 MiB	C++	730 Bytes	2026-8-25 15:17:07
AC	乐观的汤圆	28ms	5.9 MiB	C++	931 Bytes	2026-8-22 15:02:52
AC	vQ6jvZmKcn	28ms	6.8 MiB	C++	622 Bytes	2026-8-29 22:37:54
AC	热血的柴犬7235	28ms	7.4 MiB	C++	561 Bytes	2026-9-11 20:49:52
AC	活泼的水手	28ms	6.1 MiB	C++14(O2)	549 Bytes	2026-8-25 11:46:20
AC	甜美的月亮4202	29ms	7.4 MiB	C++	677 Bytes	2026-9-16 16:58:35
AC	谦虚的熊猫	29ms	8 MiB	C++	609 Bytes	2026-9-22 13:59:18
AC	S4VIuAwKG3	30ms	7.4 MiB	C++	466 Bytes	2026-9-24 23:08:48
AC	qn	219ms	11.2 MiB	Python 3	210 Bytes	2026-7-16 13:10:02
AC	淡定的松果7760	238ms	11.2 MiB	Python 3	188 Bytes	2026-9-28 22:17:54
AC	有趣的溪流8230	245ms	11.2 MiB	Python 3	571 Bytes	2026-9-21 22:25:29
AC	mbQlb4lY21	257ms	11.2 MiB	Python 3	230 Bytes	2026-8-17 16:23:52
AC	bBtRJ8GkCw	298ms	11.1 MiB	Python	222 Bytes	2026-8-28 11:07:26