February Challenge 2016
Chef and Strange Operations, Chef-Detective
March Challenge 2016
Palindromic substrings, maximize the sum
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
June Challenge 2016
Devu and an Array, Chef and Coins Game
August Challenge 2016
Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
March Challenge 2017
Bandwidth of a matrix, Xenny and Alternating Tasks, Bear and Extra Number
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
April Challenge 2020 Division 2
COVID Pandemic and Long Queue, Sell All the Cars, Unit GCD, Strange Number
June Challenge 2020 Division 2
Even Matrix, The Tom and Jerry Game!, Chef and Icecream, Chef and String, Chef and Price Control
July Challenge 2020 Division 2
Ada King, Chefina and Swaps, Missing a Point, Chef and Card Game, Chef and Strings
India