October Challenge 2017
Chef and Cycled Cycles, Max Mex, Counter Test For CHEFSUM, A Balanced Contest, (Challenge) Connecting computers, Chef and a great voluntary Program
November Challenge 2017
Chef and Intersection Line, Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Santa Delivering Problem, Chef and Hamming Distance of arrays, Penalty Shoot-out, Chef And Easy Xor Queries, Chef And his Cake, Total Diamonds
September Lunchtime 2017
Chef and Cook-Off Contests
January Challenge 2018
(Challenge) Chef and Palindromes, K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
Netherlands