October Challenge 2017
Chef and a great voluntary Program, Chef and Magic Arrays, (Challenge) Connecting computers, A Balanced Contest, Counter Test For CHEFSUM, Max Mex, Chef and Cycled Cycles
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Total Diamonds, Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
December Lunchtime 2017
Too Much Sweetness, Days in Month, Strange Function
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
Permutation and Palindrome, Car-pal Tunnel, Chef And The Patents, Chef And His Characters
March Challenge 2018 DIV 1
Chef and Easy Problem, Mix the Colors, Minions and Voting
April Challenge 2018 Division 1
Chef and Array (Challenge), Cutting Plants, Highway Crossing, Count Good Prefixes
May Challenge 2018 Division 1
Change the Signs, Fake Binary Search, Dibs on Fibs
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