October Challenge 2019 Division 2
Missing Number, Even Edges, Phone Prices, Operations on a Matrix, (Challenge) Maximizing LIS, Fun with Lists, Chef and Maximum Star Value, Bacterial Reproduction, Array Modification
November Challenge 2019 Division 2
A Simple Game, (Challenge) Coloring Triangulations, Chef and Minimum Colouring, Weapon Value, Single Point of Failure, From Zero to Infinity, Smallest Beautiful Number, Hard Sequence, Physical Exercise
December Challenge 2019 Division 1
Addition, (Challenge) Cubical Virus, Test Generation, Sticky Notes, Binomial Fever, Binary XOR, Chefina and Ranges, Scoring Pairs
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Doofish Matrix, Chefina and Prefix Suffix Sums, English, Chefland Army, (Challenge) Building Anthills
February Challenge 2020 Division 1
Chef and Railway Stations, Long Contest and Cook Off Overlaps, (Challenge) Raisins, Chef and Gordon Ramsay 2, No Change Required, Expected Change
February Lunchtime 2020 Division 1
Coronavirus, Painter Problem, Swapping to Palindrome, Monsters Battle, Secret Mission
Japan