January Challenge 2019 Division 2
Different Neighbours, Yet Another Problem About Sequences, A Pizza Slice, (Challenge) Chef and Matching Game, Fancy Quotes, Distinct Pairs, Lucky Number Game, Chef and Modulo Game
February Challenge 2019 Division 2
Art of Balance, Deputy Chef, (Challenge) Chef with Orchestra in the Kitchen, Appy and Contest, Chef and Secret Ingredients, Chef and Magical Jars, Guess It Right, Manhattan Rectangle
March Challenge 2019 Division 1
(Challenge) Interleaving Strings
June Challenge 2020 Division 1
The Tom and Jerry Game!, Operations on a Tuple, Covid Sampling (Challenge)
July Challenge 2020 Division 1
Doctor Chef, Missing a Point, Chefina and Swaps, Chef and Dragon Dens
August Challenge 2020 Division 1
Insanely Hard School Exams, Subsequence Frequency Counting, Smallest KMP, Chef and Wedding Arrangements
September Challenge 2020 Division 1
Ada Matrix, Divide Candies, Rotate the Polyline, Find XOR, Chef and Trump Cards, Chefina and Swap
November Challenge 2021 Division 1 (Unrated)
Wildcard Replacement, Weird Palindrome Making, Hill Sequence, Maximise the bridges
December Challenge 2021 Division 1 (Unrated)
Increasing String , Valleys and Hills, Rock Paper Scissors, Pyramid Traversal, Min Manhattan Distance, Squares Counting
United States