practicing git
this code is from a problemset on ICPC 2022 GUB

problem F: Proximity_Card_Data_Statistics
sample test cases:
12
01/02/2023#15:58:31 [email protected] 28/07/2001 A+
01/02/2023#17:46:00 [email protected] 13/03/2003 A+
01/02/2023#18:29:15 [email protected] 09/10/1994 A+
01/02/2023#20:09:54 [email protected] 18/07/2001 A+
01/02/2023#22:47:33 [email protected] 03/10/2002 A+
04/02/2023#20:10:10 [email protected] 04/05/2001 A+
01/02/2023#10:40:16 [email protected] 15/11/1997 A-
05/02/2023#11:21:51 [email protected] 02/11/2002 AB+
05/02/2023#11:46:17 [email protected] 16/12/1997 AB+
01/02/2023#23:20:28 [email protected] 15/06/2000 B-
02/02/2023#21:59:11 [email protected] 15/06/1997 B+
02/02/2023#21:58:11 [email protected] 15/06/1997 B-
output:
A+ 6
A- 1
AB+ 2
AB- 0
B+ 1
B- 1
O+ 0
O- 0
1994 1
1997 3
2000 1
2001 3
2002 2
2003 1