September Challenge 2019 Division 2
Chef and Interesting Subsequences , Easy Fibonacci
October Challenge 2019 Division 2
Even Edges, Missing Number, Chef and Maximum Star Value, Array Modification, Operations on a Matrix, Phone Prices
November Challenge 2019 Division 2
A Simple Game, Chef and Minimum Colouring, Weapon Value, Hard Sequence, Physical Exercise
December Challenge 2019 Division 2
Plus Multiply, Binary XOR, Easy Subsequence Selection, That Is My Score!, Addition
January Challenge 2020 Division 2
Doraemon, Breaking Bricks, Chefina and Prefix Suffix Sums, Chef and Dynamo, Equality
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Ready Bitwise, Factor Tree, Leaked Answers (Challenge)
October Challenge 2020 Division 1
Replace for X, D-Dimensional MST, Positive AND
November Challenge 2020 Division 1
Restore Sequence, Magical Candy Store, Scalar Product Tree, Unusual Queries
October Challenge 2021 Division 1 (Unrated)
Longest AND Subarray, MEX-OR
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