December Challenge 2018 Division 2
Colorblind Feast, Max and Electrical Panel, Directing Edges, Chef and Interactive XOR, Chef and Meatballs, Chef and Interactive Contests, Chef and An Ideal Problem, (Challenge) Delete DAG
January Challenge 2019 Division 2
Fancy Quotes, A Pizza Slice, (Challenge) Chef and Matching Game, Chef and Modulo Game, Lucky Number Game, Partition the Graph, Different Neighbours, Yet Another Problem About Sequences, Distinct Pairs
February Challenge 2019 Division 1
Xor Decomposition, Maximize the Tax, Art of Balance, Yet Another Tree Problem, Chef and Secret Ingredients, Guess It Right, Manhattan Rectangle
March Challenge 2019 Division 1
Chef and Soccer, Cheating on Queue, Treasure Hunt, Yet Again a Subarray Problem, Matchable Permutations
Thailand