Problems from 2015 ICPC East-Central NA Regional Contest Practice Session

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
A Towering Problem	2151	1044	49%	0.00	1060	955	90%	2.2
Bottled-Up Feelings	1751	716	41%	0.00	701	619	88%	2.6
Mastering Mastermind	1098	476	43%	0.00	475	421	89%	2.5
Shuffling Along	518	233	45%	0.00	237	211	89%	2.8