Problems from 2013 ACM-ICPC North American Qualifier

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
4 thought	10383	3507	34%	0.00	3428	2886	84%	2.4
Biggest Slice	818	201	25%	0.00	250	156	62%	6.5
Erratic Ants	1450	443	31%	0.00	509	374	73%	4.9
Even Up Solitaire	5024	1898	38%	0.00	1749	1455	83%	2.6
Goldbach's Conjecture	4352	1673	38%	0.00	1591	1297	82%	2.9
Island Buses	548	158	29%	0.00	172	121	70%	6.8
Oddities	27911	15242	55%	0.00	13602	13125	96%	1.4
Plotting Polynomials	332	260	78%	0.00	247	227	92%	2.5
Shotcube	333	48	14%	0.17	72	31	43%	8.4
Ternarian Weights	715	285	40%	0.00	318	262	82%	3.8
Trapezoid Walkway	490	229	47%	0.00	233	200	86%	3.6