Thanks to everyone who competed and congratulations to kg3209, screenl and lcyxds for winning the onsite and congratulations to serichaoo and ikaurov for winning the open!
You can gain access to the tutorials and find the original problems by entering the contest here.
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Idea: nickbelov Preparation: jdurie
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Auto comment: topic has been updated by nickbelov (previous revision, new revision, compare).
D is a nice problem, really enjoyed it in contest.
Also, L is nicer to do if you count count the number of 2 squares divided by a vertical line and horizontal line, and subtract overcounts.
rutgers orz