计算1+2+3+4......+n之和

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	ino	35ms	15.8 MiB	C++14	131 Bytes	2026-3-13 18:53:35
AC	yanghongzhe	41ms	15.8 MiB	C++14	132 Bytes	2026-3-13 18:53:57
AC	thc	238ms	15.8 MiB	Python 3	60 Bytes	2026-6-7 10:56:08
AC	yujianzhi	239ms	15.8 MiB	Python 3	63 Bytes	2026-6-9 21:28:43
AC	huangzihan	249ms	15.8 MiB	Python 3	85 Bytes	2026-7-23 16:24:31
AC	chenyifan	273ms	15.8 MiB	Python 3	79 Bytes	2026-7-23 16:24:06
AC	yuanzixi	278ms	15.8 MiB	Python 3	65 Bytes	2026-6-13 12:07:58