Problems from Southwestern Europe Regional Contest (SWERC) 2011

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Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Distributing Ballot Boxes	0.01	181	2544	2104	83%	2.5Easy	en
Guess the Numbers	0.01	198	253	138	55%	7.4Hard	en
Non-negative Partial Sums	0.04	307	175	114	65%	6.5Hard	en
Remoteland	0.13	644	94	73	78%	5.5Hard	en