June Challenge 2017
Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets, A Good Set
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator , IPC Trainers
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Sereja and Commands, Little Chef and Sums, Fill The Matrix, Minimum Good Permutation, Chef and Pick Digit
October Challenge 2017
Chef and Magic Arrays, Chef and a great voluntary Program, Chef and Cycled Cycles, Max Mex, Counter Test For CHEFSUM, A Balanced Contest, (Challenge) Connecting computers
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function
Norway