Problems from 2020 ICPC North America Regionals (March 6 2021)

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Ant Typing	529	144	27%	0.02	238	132	55%	6.2
Bad Packing	551	101	18%	0.00	230	91	40%	8.1
Basic Basis	139	29	21%	0.01	38	24	63%	7.4
Bitonic Ordering	354	84	24%	0.04	126	63	50%	7.1
Condorcet	84	22	26%	0.00	35	13	37%	9.1
Derangement Rotations	56	33	59%	0.00	27	22	81%	6.1
Dominating Duos	546	109	20%	0.08	214	87	41%	7.8
Exam Manipulation	851	241	28%	0.00	340	207	61%	5.7
Exciting Tournament	68	37	54%	0.01	37	29	78%	6.7
Kth Subtree	209	37	18%	0.06	50	31	62%	8.8
Longest Common Subsequence	351	151	43%	0.00	185	131	71%	5.7
Magic Trick	2688	1903	71%	0.00	1826	1751	96%	1.4
Missing Number	1191	439	37%	0.00	505	402	80%	3.2
No Thanks!	954	525	55%	0.00	513	461	90%	2.3
Painted Corridors	118	45	38%	0.06	37	26	70%	6.7
Rainbow Numbers	315	81	26%	0.00	122	73	60%	7.0
Rating Problems	4232	2677	63%	0.00	2569	2485	97%	1.3
Smoothie Stand	374	234	63%	0.00	231	205	89%	2.8
Triangular Collection	312	121	39%	0.00	172	118	69%	6.4
TripTik	201	55	27%	0.80	49	35	71%	7.2
Unread Messages	1112	317	29%	0.00	440	296	67%	4.6