January Challenge 2019 Division 2
Distinct Pairs, Chef and Modulo Game, Fancy Quotes, Lucky Number Game
August Challenge 2019 Division 2
Dilemma, Football, Distribute Apples, Zombie and the Caves
September Challenge 2019 Division 2
Chef and Interesting Subsequences , Chef Designed a Network, Easy Fibonacci, Chef and Good Subsequences
October Challenge 2019 Division 2
Even Edges, Missing Number, Chef and Maximum Star Value, Array Modification, Operations on a Matrix, Phone Prices
November Challenge 2019 Division 2
Physical Exercise, Hard Sequence, Weapon Value
December Challenge 2019 Division 2
Binary XOR, Addition, That Is My Score!, Plus Multiply, Easy Subsequence Selection
February Challenge 2020 Division 1
Chef and Railway Stations, Expected Change, No Change Required, The Theatre Problem, School of Geometry, Hard Cash, (Challenge) Raisins, Long Contest and Cook Off Overlaps
September Challenge 2020 Division 2
Chefina and Swap, Coronavirus Spread 2, Ada Matrix, Find XOR, Chef and Trump Cards, A Problem on Sticks
August Lunchtime 2020 Division 2
Game on a Strip, Mode of Frequencies
September Lunchtime 2020 Division 2
GCD operations, Watermelon
