August Long Challenge 2017
Greedy Candidates, Chef and Rainbow Array
September Challenge 2017
Little Chef and Sums, Minimum Good Permutation
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
September Lunchtime 2017
Chef and Cook-Off Contests
January Challenge 2018
Maximum Score, Rectangle, K-Concatenation
January Lunchtime 2018
Chef and Game with Sequence
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove, Minion Chef and Bananas
March Cook-off 2018 Division 2
Chef Judges a Competition
December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
Encoder (Rated for Division 2)
Knight Chess, Paint the Wall
January Challenge 2019 Division 2
Fancy Quotes, Distinct Pairs, Lucky Number Game
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game, Chef and a Beautiful Digit
August Challenge 2019 Division 2
Dilemma, Football, Distribute Apples, Zombie and the Caves
September Challenge 2019 Division 2
Easy Fibonacci, Chef and Interesting Subsequences
April Challenge 2020 Division 2
Sell All the Cars, COVID Pandemic and Long Queue
India