求平均年龄？

状态	递交者	时间	内存	语言	代码	递交时间
AC	zhangjiayi	41ms	14.8 MiB	C++11(O2)	333 Bytes	2024-6-8 15:45:00
AC	majiatong	41ms	14.8 MiB	C++11(O2)	330 Bytes	2025-2-14 18:43:32
AC	huyushuo	45ms	14.8 MiB	C++11(O2)	316 Bytes	2025-2-14 19:21:24
AC	songyitian	45ms	14.8 MiB	C++11(O2)	330 Bytes	2025-2-21 6:39:12
AC	chq315	45ms	14.2 MiB	C++17(O2)	724 Bytes	2024-5-8 20:05:06
AC	sunyian	46ms	14.8 MiB	C++11(O2)	266 Bytes	2025-2-14 18:47:32
AC	yangbowen	47ms	14.9 MiB	C++14(O2)	363 Bytes	2024-6-14 19:00:53
AC	dongyantao	48ms	14.8 MiB	C++11(O2)	263 Bytes	2025-2-21 18:15:14
AC	shixintong	49ms	12.8 MiB	C++11(O2)	297 Bytes	2025-1-19 9:07:37
AC	songxinhang	54ms	14.3 MiB	C++17	272 Bytes	2024-5-12 10:53:13
AC	lishengcheng	55ms	14.8 MiB	C++17	295 Bytes	2024-6-8 20:33:15
AC	zhangshangchenshuo	55ms	12.8 MiB	C++11(O2)	286 Bytes	2025-1-19 8:57:57
AC	zhangkaixin	56ms	14.8 MiB	C++11(O2)	278 Bytes	2024-6-23 14:33:05
AC	liujiahao	56ms	14.9 MiB	C++11(O2)	278 Bytes	2024-6-23 15:34:31
AC	zhengyizhe	57ms	14.9 MiB	C++11(O2)	299 Bytes	2024-6-23 15:38:38
AC	lisibo	57ms	14.3 MiB	C++17	296 Bytes	2024-5-12 11:25:44
AC	chenyixuan	61ms	14.8 MiB	C++17	300 Bytes	2024-6-23 14:17:08
AC	zhaozirui	64ms	14.9 MiB	C++11(O2)	278 Bytes	2024-6-23 16:08:28