July Challenge 2015
Na2a and lucky stone, Bread, Chef and Cube
August Challenge 2015
Gravity Guy, Cooking Machine, Aditi and Magic Trick
October Challenge 2015
Count Subarrays, Who dares to be a millionaire
August Cook-Off 2015
Chef and the Wildcard Matching
July Lunchtime 2015
Greedy puppy, Puppy and game
March Challenge 2016
Palindromic substrings, maximize the sum
May Challenge 2016
Laddu, Chef and Balls, Forest Gathering
June Challenge 2016
Chef And The Hiring Event, Chef And Binary Operation, Chef and Coins Game, Devu and an Array
July Challenge 2016
Andrash and Stipendium, Chefland and Electricity
August Challenge 2016
Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and digits of a number, Chef and calculation, Faded Palindromes
October Challenge 2016
Chef and Keyboard, Chef and Three Dogs
February Challenge 2017
Chef and Triangles, Chef and His Apartment Dues
October Challenge 2017
Max Mex, A Balanced Contest
India