December Challenge 2018 Division 2
Chef and An Ideal Problem, Chef and Interactive Contests
November Challenge 2018 Division 2
Chef and Difficult Contests
February Challenge 2019 Division 2
Chef and Magical Jars, Appy and Contest, Deputy Chef
May Cook-Off 2019 Division 2
Chain Reaction, Recover the Sequence
August Challenge 2019 Division 2
Football, Zombie and the Caves, Distribute Apples, Dilemma
September Challenge 2019 Division 2
Easy Fibonacci, Chef and Interesting Subsequences
October Challenge 2019 Division 2
Chef and Maximum Star Value, Array Modification, Operations on a Matrix, Phone Prices
November Challenge 2019 Division 2
Hard Sequence, Weapon Value
June Challenge 2020 Division 2
The Tom and Jerry Game!, Chef and Icecream, Chef and String, Chef and Price Control, Even Matrix
December Challenge 2020 Division 2
Positive Prefixes, Even Pair Sum, Vaccine Production, Vaccine Distribution
November Cook-Off 2020 Division 2
Chef and IPC Certificates
January Challenge 2021 Division 3
Chef and Division 3, Encoded String
February Challenge 2021 Division 3
Team Name, Highest Divisor, Maximise Function, Prime Game, Chef and Meetings, Frog Sort
July Challenge 2021 Division 3 (Rated)
XxOoRr, Maximum Production, Relativity
August Challenge 2021 Division 3 (Rated)
Special Triplets, Array Filling, Chef and Bulb Invention, Problem Difficulties, Olympics Ranking
India