December Challenge 2019 Division 2
Easy Subsequence Selection
January Challenge 2020 Division 2
Chef and Dynamo, Doraemon, Equality, Chefina and Prefix Suffix Sums, Breaking Bricks
February Challenge 2020 Division 2
Chef and Railway Stations, No Change Required, The Theatre Problem, School of Geometry, Hard Cash, (Challenge) Raisins, Long Contest and Cook Off Overlaps
March Challenge 2020 Division 2
XOR Engine, Pintu and Fruits
May Challenge 2020 Division 2
Coronavirus Spread, Isolation Centers
January Cook-Off 2020 Division 2
Chef Chick, Exam Cheating
January Lunchtime 2020 Division 2
Bob and His Friends, Chef and Street Food, Under the Tunnels
UWCOI 2020 (Rated for all)
Button Pairs, Find maximum in an Array
June Challenge 2020 Division 2
Even Matrix, The Tom and Jerry Game!, Chef and Icecream, Covid Sampling (Challenge), Chef and String, Chef and Price Control
India