November Challenge 2018 Division 2
Chef and Ridges, Chef and Difficult Contests, Chef and Happiness
October Challenge 2018 Division 2
Appy and Balloons , Minimize Digitsum, Chef and Serves, Byte to Bit
February Challenge 2019 Division 2
Deputy Chef, Art of Balance, Appy and Contest, Chef and Magical Jars, Guess It Right, Manhattan Rectangle, Chef and Secret Ingredients
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game, Chef and a Beautiful Digit
September Challenge 2019 Division 2
Easy Fibonacci, Chef and Interesting Subsequences , Chef Designed a Network, Chef and Good Subsequences
October Challenge 2019 Division 1
Even Edges, Chef and Maximum Star Value, Array Modification
January Challenge 2020 Division 2
Chef and Dynamo, (Challenge) Building Anthills, Breaking Bricks, Equality, Doraemon, Chefina and Prefix Suffix Sums
February Challenge 2020 Division 1
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
Ready Bitwise, Leaked Answers (Challenge), Squared Subsequences, Strange Number
February Lunchtime 2020 Division 1
Swapping to Palindrome, Secret Mission
Biteration #2 (Rated for Division 2)
A - Books, B - Candy Love, D - Break the Rules
UWCOI 2020 (Rated for all)
Button Pairs, Base Plans, Find maximum in an Array
India