Problems from 2013 ACM-ICPC North American Qualifier

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
4 thought	8623	2899	34%	0.00	2861	2383	83%	2.8
Biggest Slice	791	189	24%	0.00	240	148	62%	6.6
Erratic Ants	1383	415	30%	0.00	478	348	73%	4.9
Even Up Solitaire	4633	1697	37%	0.00	1566	1291	82%	2.7
Goldbach's Conjecture	4119	1593	39%	0.00	1505	1228	82%	2.7
Island Buses	522	154	30%	0.00	161	117	73%	6.3
Oddities	24749	13576	55%	0.00	12144	11724	97%	1.3
Plotting Polynomials	310	244	79%	0.00	232	212	91%	2.5
Shotcube	331	47	14%	0.17	71	30	42%	8.2
Ternarian Weights	671	272	41%	0.00	299	250	84%	3.7
Trapezoid Walkway	478	221	46%	0.00	226	194	86%	3.5