January Challenge 2019 Division 2
Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, Different Neighbours
September Challenge 2019 Division 2
Chef and Good Subsequences, Easy Fibonacci, Biladerim Icin, Fuzzy Linear Combinations, Expected GCD, Doofish Set, Chef Designed a Network, Chef and Interesting Subsequences
October Challenge 2019 Division 2
Even Edges, Phone Prices, Operations on a Matrix, Array Modification, Chef and Maximum Star Value, Missing Number
December Challenge 2019 Division 1
Chefina and Ranges, Binary XOR, Binomial Fever, Sticky Notes, Addition
March Challenge 2020 Division 1
Chef and DAG, Lasers Everywhere
Taiwan