January Challenge 2019 Division 2
Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, A Pizza Slice, Yet Another Problem About Sequences
February Challenge 2019 Division 2
Guess It Right, Deputy Chef, Art of Balance, Appy and Contest, Chef and Secret Ingredients, Chef and Magical Jars, Manhattan Rectangle
March Challenge 2019 Division 2
(Challenge) Interleaving Strings, Chef and a Beautiful Digit, Yet Again a Subarray Problem, Cheating on Queue, Chef got Recipes, Chef and Soccer, Chef and Number Game
April Challenge 2019 Division 1
Playing with Numbers, Subtree Removal
May Challenge 2019 Division 1
Ada Rooks 2, Where to Build the Roads
September Challenge 2019 Division 1
Fuzzy Linear Combinations, Chef Designed a Network
October Challenge 2020 Division 1
D-Dimensional MST, Replace for X, Positive AND
January Challenge 2021 Division 2
Chef and Ants, Guess the Tiling, Expected Number of SCCs, Watching CPL, Fair Elections
December Challenge 2020 Division 1
Hail XOR, Square Root of LCA Convolution, String Operations, Positive Prefixes, Even Pair Sum
Australia