第2题-迷你文本编辑器的撤销与重做功能

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	弓长永弓虽	62ms	6.8 MiB	C++17(O2)	2.3 KiB	2026-7-1 15:00:57
AC	PvPJQtbzDh	68ms	6.8 MiB	C++17(O2)	1.6 KiB	2026-6-22 20:55:10
AC	ae5lYV2Bsv	95ms	7 MiB	C++	1.9 KiB	2026-6-21 17:13:25
AC	DSC4MoFRr4	104ms	6.7 MiB	C++	1.8 KiB	2026-6-20 13:56:58
AC	JIAAAA	106ms	7.1 MiB	C++14(O2)	2.7 KiB	2026-6-22 11:31:42
AC	HXbPqS8qFh	111ms	6.8 MiB	C++11	1.8 KiB	2026-7-6 11:24:32
AC	Tan2026	117ms	7.1 MiB	C++17(O2)	2 KiB	2026-6-20 17:06:07
AC	qfnIlNAfJR	126ms	22.9 MiB	C++17(O2)	2.4 KiB	2026-6-19 16:33:49
AC	jMvAVmIsFq	133ms	19.2 MiB	C++17(O2)	1.1 KiB	2026-6-28 18:54:09
AC	kJCHGLSmj0	134ms	6.7 MiB	C++17(O2)	1.5 KiB	2026-6-20 21:20:29
AC	K29kEtj8AY	167ms	6.7 MiB	C++	2.3 KiB	2026-7-2 16:01:24
AC	Re6cykYjCF	170ms	22.8 MiB	C++17(O2)	1.8 KiB	2026-6-21 10:42:47
AC	aCOyiuO328	170ms	22.8 MiB	C++17(O2)	1.8 KiB	2026-6-18 9:41:25
AC	CodeFund2c74adcdb	181ms	22.9 MiB	C++17(O2)	2.6 KiB	2026-6-24 12:23:04
AC	DjfX2eK4Un	246ms	19.4 MiB	C++17(O2)	2.6 KiB	2026-7-4 15:25:42
AC	t4NFLBJSAM	461ms	26.8 MiB	Python 3	1.9 KiB	2026-6-22 13:26:02
AC	XW1g4AQ1h4	486ms	28.5 MiB	Python 3	1.5 KiB	2026-6-23 11:25:59
AC	QQoWFQuI6U	496ms	27.8 MiB	Python 3	1.3 KiB	2026-6-18 11:08:11
AC	oTK0h8CTeR	592ms	38.8 MiB	Python 3	1.8 KiB	2026-6-22 9:24:00
AC	hexi	666ms	38.8 MiB	Python 3	1.8 KiB	2026-7-1 12:03:08
AC	AutRiver	681ms	6.7 MiB	C++17(O2)	1.6 KiB	2026-6-23 11:24:47
AC	UXtNdEkSta	1103ms	16 MiB	Python 3	1.3 KiB	2026-6-24 23:06:57
AC	A0b99Ihlsg	1196ms	91.6 MiB	Javascript (JSC)	1.6 KiB	2026-6-24 15:37:23
AC	9R2jVvrYbX	1198ms	15.9 MiB	Python 3	1.1 KiB	2026-6-20 13:08:52
AC	ms2Jh1iIS2	1217ms	16 MiB	Python 3	1.1 KiB	2026-6-22 18:49:21
AC	AoU9AnjC7d	1228ms	16.2 MiB	Python 3	957 Bytes	2026-7-6 21:16:11
AC	k7aXVPbJFM	1271ms	65.1 MiB	Java	2.4 KiB	2026-6-24 17:04:16
AC	dtl4OTVUok	1279ms	7.1 MiB	C++17(O2)	1.8 KiB	2026-6-24 4:13:52
AC	cHGM2ItM5m	1353ms	42.7 MiB	Python 3	891 Bytes	2026-6-19 13:38:56
AC	assert	1388ms	105.4 MiB	PyPy3	1.3 KiB	2026-6-21 19:11:40
AC	CodeFun38d9894f7c	1463ms	76.1 MiB	Java	3.4 KiB	2026-6-20 1:47:23
AC	lybhit2002@163.com	2354ms	15.1 MiB	Python 3	1.6 KiB	2026-6-22 11:46:33
AC	0JLpxh9AzY	3182ms	205.2 MiB	PyPy3	831 Bytes	2026-7-7 17:24:42
AC	bZCd6uZ3EW	3229ms	98.9 MiB	Java	1.5 KiB	2026-6-20 22:21:28
AC	ghvr	3280ms	14.3 MiB	Python 3	1.8 KiB	2026-7-7 16:44:46
AC	Z7I87ksnep	4207ms	122.8 MiB	Java	2.6 KiB	2026-6-25 20:07:44
AC	6QSmWiL7tL	4290ms	122.6 MiB	Java	2.4 KiB	2026-7-6 11:54:19
AC	lingqi	4502ms	122.6 MiB	Java	2.3 KiB	2026-6-24 16:13:32
AC	1P3IPu6j01	4584ms	137.9 MiB	Java	3 KiB	2026-6-23 17:02:20