July Challenge 2019 Division 2
Guess the Prime!, Parity Again, Circular Merging, Minimum and Maximum, Chef and Mean , Hit the Coconuts
October Challenge 2019 Division 2
Even Edges, Missing Number, Bacterial Reproduction, Chef and Maximum Star Value, Array Modification, Operations on a Matrix, Phone Prices
November Challenge 2019 Division 1
Physical Exercise, From Zero to Infinity, Smallest Beautiful Number
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Chefina and Prefix Suffix Sums
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Perfect Power Divisors, Ready Bitwise, Factor Tree, Leaked Answers (Challenge)
China