December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem, Max and Electrical Panel
November Challenge 2018 Division 2
Chef and Ridges, Chef and Difficult Contests, Chef and Happiness
October Challenge 2018 Division 2
Minimize Digitsum, Chef and Serves, Byte to Bit
March Challenge 2019 Division 2
Chef and Number Game, Chef and a Beautiful Digit
September Challenge 2021 Division 3 (Rated)
Airline Restrictions, Travel Pass, Shuffling Parities
October Challenge 2021 Division 3 (Rated)
Longest AND Subarray, Digit Removal, MEX-OR, Three Boxes, Which Mixture
November Challenge 2021 Division 3 (Rated)
Weird Palindrome Making, Hill Sequence, Equal Coins, Which Fuel is Cheaper, Maximise the bridges
December Challenge 2021 Division 2 (Unrated)
Valleys and Hills, List of Lists
