May Challenge 2019 Division 2
Reduce to One, Matches, Where to Build the Roads
July Challenge 2019 Division 2
Minimum and Maximum, Chef and Mean
August Challenge 2019 Division 2
Zombie and the Caves, Distribute Apples, Football, Dilemma, Encoding, Guddu and his Mother
September Challenge 2019 Division 2
Chef and Good Subsequences, Easy Fibonacci, Chef Designed a Network, Chef and Interesting Subsequences
October Challenge 2019 Division 1
Even Edges, Array Modification
December Challenge 2019 Division 2
Addition, That Is My Score!, Plus Multiply, Binary XOR
February Challenge 2020 Division 2
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
April Challenge 2020 Division 1
Strange Number, Leaked Answers (Challenge), Ready Bitwise, Squared Subsequences
April Challenge 2021 Division 2
Binary String MEX, Tree Permutations, Worthy Matrix, Destroy the EMP Chip, Chef and Dice, Boolean Game
India