December Challenge 2019 Division 2
Binary XOR, Easy Subsequence Selection, That Is My Score!, Addition, Plus Multiply
December Lunchtime 2019 Division 2
Stupid Machine, Check Algorithm, Guess the number
January Challenge 2020 Division 2
Doofish Matrix, (Challenge) Building Anthills, Breaking Bricks, English, Chefina and Prefix Suffix Sums, Equality, Doraemon, Chef and Dynamo
February Challenge 2020 Division 1
Expected Change, Long Contest and Cook Off Overlaps, (Challenge) Raisins, Hard Cash, School of Geometry, The Theatre Problem, No Change Required, Chef and Railway Stations
July Challenge 2020 Division 1
Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef, Weird Product
February Challenge 2021 Division 1
Team Name, Another Tree with Number Theory, Prime Game, Multiple Games, XOR Sums
India