Problems from Southwestern Europe Regional Contest (SWERC) 2011

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Distributing Ballot Boxes 5434 1404 26% 0.04 1017 857 84% 4.4
Guess the Numbers 429 89 21% 0.01 117 61 52% 8.4
Non-negative Partial Sums 224 71 32% 0.04 69 53 77% 4.8
Remoteland 87 33 38% 0.18 27 22 81% 5.7