September Challenge 2015
Count Steps in Matrix, Chain of Doughnuts
October Challenge 2015
Count Subarrays, Who dares to be a millionaire, Spheres, Time measure
February Challenge 2016
Chef and Strange Operations, Chef-Detective
March Challenge 2016
Chef And Special Dishes, maximize the sum, Palindromic substrings
June Challenge 2016
Chef And The Hiring Event, Chef and Array and K, Chef And Binary Operation, Chef and Coins Game, Devu and an Array
July Challenge 2016
Chefland and Electricity, Chef and Robots Competition, Chef and Tetris, Andrash and Stipendium, Chef and Segments
August Challenge 2016
Chef and Circle Run, Chef and Chocolate, Chef and Round Run
September Challenge 2016
Faded Palindromes, Chef and calculation, JosephLand, Chef and digits of a number, Chef and Matrix Division, Dividing Machine, Chef and Friends
October Lunchtime 2017
Buggy Calculator, Maximum Number
India