NAIPC is happening again on March 2nd (start time). Information about the contest can be found on this page. Information about registering can be found on here. You can register in teams of up to 3. The deadline for registration is February 28th. This contest will be hosted on Kattis again.
A few hours later, it will be available as an open cup round as the Grand Prix of America (start time). Please participate in only one of them, and don't discuss problems here until after the open cup round has ended.
UPD 1: Registration is ending soon.
UPD 2: Please don't discuss until after open cup is over.
UPD 3: You can find test data and solutions here: http://serjudging.vanb.org/?p=1349