[ABC214B] 有多少个？（How many?）

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	邱怡辰	28ms	6.2 MiB	C++14(O2)	383 Bytes	2025-9-14 10:45:47
AC	方一帆	28ms	6.2 MiB	C++14(O2)	307 Bytes	2025-9-14 11:10:59
AC	王嘉怡	33ms	6.2 MiB	C++14(O2)	243 Bytes	2025-9-13 15:55:09
AC	jike1994	38ms	6.2 MiB	C++14(O2)	289 Bytes	2025-9-12 14:17:26