October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest, (Challenge) Connecting computers, Chef and a great voluntary Program
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef and Universe, Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Chef and Hamming Distance of arrays
December Lunchtime 2017
Days in Month, Strange Function
January Challenge 2018
(Challenge) Chef and Palindromes, K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
January Cook-Off 2018
Multiple of 3, Survive in ChocoLand
May Challenge 2018 Division 1
Mighty Friend, Dibs on Fibs, Fake Binary Search, Minimum Deletions, Change the Signs, Xor Again
June Challenge 2018 Division 1
Vision, Sheokand and String, Binary Shuffle, Naive Chef
July Challenge 2018 Division 1
No Strings Attached, Strike or Spare, Magic Set, Gears, No Minimum No Maximum, Reach Equilibrium
January Challenge 2019 Division 1
Yet Another Problem About Sequences, Different Neighbours, Partition the Graph, Distinct Pairs, A Pizza Slice
June Challenge 2019 Division 1
Lent Money, Chef and Ingredients, Sum and GCD
June Cook-Off 2019 Division 1
Ants and Anteaters, Drink Slush
India