Problems from 2013 ACM-ICPC North American Qualifier

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
4 thought	11722	4023	34%	0.00	3862	3264	85%	2.6
Biggest Slice	936	227	24%	0.00	268	170	63%	6.4
Erratic Ants	1491	458	31%	0.00	527	388	74%	4.9
Even Up Solitaire	6014	2391	40%	0.00	2122	1779	84%	2.6
Goldbach's Conjecture	4653	1833	39%	0.00	1721	1418	82%	2.6
Island Buses	582	167	29%	0.00	190	130	68%	7.1
Oddities	30017	16481	55%	0.00	14635	14122	96%	1.3
Plotting Polynomials	357	283	79%	0.00	269	250	93%	2.4
Shotcube	343	50	15%	0.17	75	33	44%	8.7
Ternarian Weights	830	340	41%	0.00	357	296	83%	3.8
Trapezoid Walkway	521	250	48%	0.00	251	217	86%	3.5