Problems from Southwestern Europe Regional Contest (SWERC) 2011

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Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Distributing Ballot Boxes	0.04	181	2425	1990	82%	3.4Medium	en
Guess the Numbers	0.01	198	249	135	54%	7.5Hard	en
Non-negative Partial Sums	0.04	420	174	112	64%	6.7Hard	en
Remoteland	0.13	644	81	63	78%	5.0Medium	en