求字符首次出现的位置？

状态	递交者	时间	内存	语言	代码	递交时间
AC	liangjiarui	4ms	2.1 MiB	C++	340 Bytes	2025-7-26 11:58:52
AC	cheng	4ms	2.1 MiB	C++	417 Bytes	2025-7-26 11:31:56
AC	weihaotong	4ms	2.1 MiB	C++	392 Bytes	2025-7-26 11:24:53
AC	hemingxuan	4ms	2.5 MiB	C++	473 Bytes	2025-7-17 16:05:02
AC	hujuncheng	4ms	2.1 MiB	C++	557 Bytes	2025-7-27 18:32:28
AC	huangtianze	4ms	532 KiB	C++14(O2)	433 Bytes	2025-10-17 20:36:39
AC	zhaotongyu	4ms	508 KiB	C++14(O2)	400 Bytes	2025-10-17 20:42:28
AC	shiyunfei	5ms	1.9 MiB	C++	396 Bytes	2021-12-3 16:55:12
AC	lihaoyang	5ms	1.9 MiB	C++	408 Bytes	2022-1-17 9:33:20
AC	xiangyulin	5ms	1.9 MiB	C++	437 Bytes	2021-12-3 20:15:01
AC	konglingsen	5ms	2.1 MiB	C++	410 Bytes	2024-12-19 8:15:17
AC	luojinghao	6ms	1.9 MiB	C++	396 Bytes	2022-1-1 15:59:19
AC	qiujuntao	6ms	2 MiB	C++	430 Bytes	2022-1-17 9:32:55
AC	langshicheng	7ms	2.1 MiB	C++	413 Bytes	2023-6-24 8:30:52