December Challenge 2018 Division 2
(Challenge) Delete DAG, Max and Electrical Panel, Chef and Interactive XOR, Chef and Meatballs, Chef and Interactive Contests, Chef and An Ideal Problem
November Challenge 2018 Division 2
Chef and Ridges, Appy Loves One, Good Median, Chef, Primes and Trees (Challenge), Chef and Difficult Contests, Chef and Happiness
October Lunchtime 2018 Division 2
Coloring the Grid, Three Friends
January Challenge 2019 Division 1
Yet Another Problem About Sequences, Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, A Pizza Slice
February Challenge 2019 Division 1
Chef and Magical Jars, Chef and Secret Ingredients, Appy and Contest, Art of Balance, Deputy Chef
April Challenge 2019 Division 2
Friend or Girlfriend, Fencing, Maximum Remaining, Subtree Removal
June Challenge 2019 Division 1
Chef and Ingredients, Sum and GCD
December Challenge 2019 Division 2
Chefina and Ranges, Plus Multiply, Binary XOR, Easy Subsequence Selection, Sticky Notes, (Challenge) Cubical Virus, That Is My Score!, Addition
January Challenge 2020 Division 1
Chef and Dynamo, (Challenge) Building Anthills, Chefland Army, Breaking Bricks, Chefina and Prefix Suffix Sums, Equality, Doraemon
February Challenge 2020 Division 1
Chef and Railway Stations, No Change Required, School of Geometry, Hard Cash, (Challenge) Raisins, Long Contest and Cook Off Overlaps
India