February Challenge 2017
Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, Bandwidth of a matrix
May Challenge 2017
Courses in an university, Median of adjacent maximum numbers
November Challenge 2017
Chef goes Left Right Left, Villages and Tribes
March Challenge 2018 DIV 2
Mix the Colors, Minion Chef and Bananas, Minions and Voting, Chef and Glove, A Big Sale, Chef and Easy Problem, Pishty and Triangles
March Cook-off 2018 Division 2
Chef Goes to the Cinema, Chef Restores a Matrix, Chef Judges a Competition
June Challenge 2018 Division 2
Vision, Sheokand and String, Binary Shuffle, Naive Chef
August Lunchtime 2018 Division 1
Chef and Eid, Mix Mix Game
India