April Challenge 2018 Division 2
Chef and Array (Challenge), Workers, Average of Pairs, Count Good Prefixes, Weight of Numbers, Cutting Plants, Highway Crossing
May Challenge 2018 Division 2
Mighty Friend, Change the Signs, Minimum Deletions, Xor Again, Fake Binary Search, Dibs on Fibs
December Challenge 2018 Division 1
Max and Electrical Panel, Chef and Interactive XOR
January Challenge 2019 Division 1
Yet Another Problem About Sequences, Different Neighbours, Distinct Pairs, A Pizza Slice
February Challenge 2019 Division 1
Art of Balance, (Challenge) Chef with Orchestra in the Kitchen, Guess It Right, Manhattan Rectangle, Chef and Secret Ingredients
March Challenge 2019 Division 1
Chef and Soccer, Cheating on Queue, Yet Again a Subarray Problem, (Challenge) Interleaving Strings
April Challenge 2019 Division 1
Offer for Chef, Kira Loves Palindromes, Mininum XOR over Tree, Playing with Numbers, Subtree Removal, Moving Rectangles (Challenge)
March Challenge 2020 Division 1
Chef and DAG, Lasers Everywhere Alternative, Inverse of a Function, Lasers Everywhere, Winning Ways 2, Break
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Perfect Power Divisors, Ready Bitwise, Factor Tree, A Leisurely Journey, Line Line Line Graph, Leaked Answers (Challenge)
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