November Challenge 2018 Division 2
Appy Loves One, Chef and Ridges, Chef and Happiness, Chef and Difficult Contests, Binary Strings, Chef, Primes and Trees (Challenge), Good Median, Magician versus Chef 2
December Lunchtime 2018 Division 2
Print Pattern, Choosing from Buckets, Drawing Lines, Age Calculator
January Challenge 2019 Division 1
Partition the Graph, A Pizza Slice, (Challenge) Chef and Matching Game, Party, Maximum Distance, Distinct Pairs, Different Neighbours, Yet Another Problem About Sequences
February Challenge 2019 Division 1
Maximize the Tax, Art of Balance, (Challenge) Chef with Orchestra in the Kitchen, Xor Decomposition, Chef and Secret Ingredients, Guess It Right, Manhattan Rectangle, Yet Another Tree Problem
March Challenge 2019 Division 1
(Challenge) Interleaving Strings, Matchable Permutations, Yet Again a Subarray Problem, Treasure Hunt, Perfect Tree Problem, Sonya and Tree, Cheating on Queue, Chef and Soccer
March Lunchtime 2019 Division 1
Corrupted Seven-Segment Display, Travelling Saleschef, Partition into Permutations
September Challenge 2019 Division 1
Biladerim Icin, Fuzzy Linear Combinations, Expected GCD, Doofish Set, Dodgers, Power Sum, Chef Designed a Network, (Challenge) Sebi and CPU Design
China