Problems from 2013 ACM-ICPC North American Qualifier

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
4 thought	9049	3083	34%	0.00	3034	2539	84%	2.6
Biggest Slice	791	189	24%	0.00	240	148	62%	6.6
Erratic Ants	1401	426	30%	0.00	489	358	73%	4.8
Even Up Solitaire	4800	1764	37%	0.00	1642	1351	82%	2.9
Goldbach's Conjecture	4261	1657	39%	0.00	1563	1281	82%	2.7
Island Buses	524	155	30%	0.00	162	118	73%	6.3
Oddities	25849	14168	55%	0.00	12651	12220	97%	1.3
Plotting Polynomials	321	251	78%	0.00	238	218	92%	2.5
Shotcube	333	48	14%	0.17	72	31	43%	8.4
Ternarian Weights	681	276	41%	0.00	304	253	83%	3.7
Trapezoid Walkway	480	223	46%	0.00	228	196	86%	3.5