December Challenge 2018 Division 2
Max and Electrical Panel, Directing Edges, Chef and Interactive XOR, Chef and Meatballs, Chef and Interactive Contests, Chef and An Ideal Problem, (Challenge) Delete DAG
November Challenge 2018 Division 2
Magician versus Chef 2, Chef and Happiness, Chef and Difficult Contests, Good Median, Appy Loves One, Chef and Ridges
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
January Challenge 2019 Division 2
Different Neighbours, A Pizza Slice, Fancy Quotes, Chef and Modulo Game, Distinct Pairs, Lucky Number Game, Yet Another Problem About Sequences
May Challenge 2019 Division 2
Ada Rooks 2, Matches, Reduce to One, Where to Build the Roads
July Challenge 2019 Division 1
Guess the Prime!, Circular Merging
August Challenge 2019 Division 1
Guddu and his Mother, Encoding, Dilemma, Maximize an Expression, Chef and Gordon Ramsay
India