实现change函数

状态	递交者	时间	内存	语言	代码	递交时间
AC	liangweilin	18ms	544 KiB	C++14(O2)	39 Bytes	2026-5-17 15:27:00
AC	wengzhaoyu8	18ms	696 KiB	C++14	41 Bytes	2026-2-28 21:14:15
AC	zhanghongyi	19ms	540 KiB	C++14(O2)	37 Bytes	2026-5-17 15:22:07
AC	huangweilun	19ms	760 KiB	C++14(O2)	37 Bytes	2026-5-17 15:22:34
AC	zengjianbo	19ms	760 KiB	C++14(O2)	38 Bytes	2026-4-3 17:30:54
AC	jiangzhuoxi8	19ms	504 KiB	C++14(O2)	37 Bytes	2026-5-16 16:31:26
AC	heyuxuan	19ms	504 KiB	C++14(O2)	37 Bytes	2026-5-16 16:32:30
AC	hemingxuan	20ms	504 KiB	C++20(O2)	37 Bytes	2026-5-17 15:29:22
AC	lizishan	20ms	832 KiB	C++20(O2)	42 Bytes	2026-3-1 9:13:31
AC	guanxuxuan	20ms	504 KiB	C++14(O2)	37 Bytes	2026-5-16 16:32:55
AC	liuxiaofan	20ms	576 KiB	C++14	66 Bytes	2026-5-16 16:17:27
AC	wuzhaoyi	21ms	504 KiB	C++14(O2)	38 Bytes	2026-3-1 15:46:03
AC	huangtianze	22ms	504 KiB	C++14(O2)	44 Bytes	2026-5-16 16:40:27
AC	wangziyao	22ms	508 KiB	C++14(O2)	39 Bytes	2026-5-16 16:40:04
AC	liangjunxi	23ms	532 KiB	C++14(O2)	37 Bytes	2026-5-16 16:37:55