1343C-AlternatingSubsequence.cpp 1344A-HilbertsHotel.cpp 1345A-PuzzlePieces.cpp 1350A-OracAndFactors.cpp 1350B-OracAndModels.cpp 1351A-A+B_TrialProblem.cpp 1351B-Square.cpp 1351C-Skier.cpp 1352A-SumOfRoundNumber