Problems from North America Championship 2020

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
All Kill	21	16	76%	0.00	15	14	93%	4.6
Another Coin Weighing Puzzle	319	106	33%	0.01	92	79	86%	4.4
Bomas	316	104	33%	0.18	58	47	81%	6.7
Editing Explosion	88	71	81%	0.06	44	42	95%	3.5
Grid Guardian	67	27	40%	0.63	15	10	67%	7.6
Hopscotch 50	564	280	50%	0.00	222	208	94%	2.3
ICPC Camp	536	149	28%	0.16	123	109	89%	3.8
Letter Wheels	497	170	34%	0.13	137	123	90%	3.8
Lunchtime Name Recall	361	76	21%	1.13	52	39	75%	7.0
Mini Battleship	302	210	70%	0.02	153	143	93%	2.9
Rooted Subtrees	326	142	44%	0.15	114	106	93%	3.2
Tomb Raider	271	70	26%	0.03	58	52	90%	4.1