Problems from International Collegiate Programming Contest (ACM-ICPC) World Finals 2013

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Factors	1718	454	26%	0.01	380	302	79%	5.7
Harvard	349	53	15%	0.26	75	45	60%	9.3
Hey, Better Bettor	281	113	40%	0.00	97	76	78%	6.5
Low Power	1939	448	23%	0.11	509	370	73%	5.1
Map Tiles	97	27	28%	0.35	31	22	71%	8.6
Pirate Chest	454	144	32%	0.41	128	101	79%	7.6
Pollution Solution	950	221	23%	0.00	202	157	78%	6.1
Self-Assembly	922	321	35%	0.00	363	256	71%	4.0
Surely You Congest	986	331	34%	0.10	244	218	89%	3.9
Up a Tree	131	56	43%	0.02	52	43	83%	8.5
Матрёшка	751	259	34%	0.07	233	190	82%	4.4