Problems from 2013 ACM-ICPC North American Qualifier

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
4 thought	13580	4695	35%	0.00	4477	3777	84%	2.9
Biggest Slice	1129	278	25%	0.00	305	195	64%	6.4
Erratic Ants	1635	495	30%	0.00	573	424	74%	5.0
Even Up Solitaire	6945	2768	40%	0.00	2422	2044	84%	2.8
Goldbach's Conjecture	5268	2105	40%	0.00	1973	1651	84%	2.3
Island Buses	654	187	29%	0.00	218	146	67%	7.1
Oddities	34312	18709	55%	0.00	16480	15858	96%	1.3
Plotting Polynomials	394	304	77%	0.00	291	269	92%	2.4
Shotcube	384	63	16%	0.17	83	38	46%	8.4
Ternarian Weights	877	363	41%	0.00	376	313	83%	3.9
Trapezoid Walkway	549	269	49%	0.00	267	233	87%	3.5