Problems from North America Championship 2020

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
All Kill	69	56	81%	0.00	41	35	85%	3.3
Another Coin Weighing Puzzle	527	149	28%	0.00	131	105	80%	6.1
Bomas	429	126	29%	0.18	77	60	78%	6.7
Editing Explosion	113	87	77%	0.06	61	57	93%	4.3
Grid Guardian	70	27	39%	0.63	18	10	56%	7.8
Hopscotch 50	1154	503	44%	0.00	347	316	91%	2.8
ICPC Camp	1042	305	29%	0.15	203	175	86%	4.6
Letter Wheels	966	298	31%	0.11	214	181	85%	5.0
Lunchtime Name Recall	432	94	22%	1.10	71	50	70%	6.9
Mini Battleship	672	383	57%	0.02	253	227	90%	3.6
Rooted Subtrees	947	261	28%	0.14	183	168	92%	3.6
Tomb Raider	342	88	26%	0.03	78	66	85%	4.9