December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem
November Challenge 2018 Division 2
Chef and Ridges, Chef and Difficult Contests, Chef and Happiness
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
February Challenge 2019 Division 2
Chef and Secret Ingredients, Appy and Contest, Deputy Chef
December Challenge 2019 Division 2
Plus Multiply, That Is My Score!
Azerbaijan