May Challenge 2016
Chef and math, Chef and Balls, Forest Gathering, Chef and Big Soccer, Laddu, Sereja and GCD 2
June Challenge 2016
Chef and Array and K, Chef and Sad Pairs, Devu and an Array, Chef and cities, Chef and Coins Game, Chef And Binary Operation, Chef and Rectangle Array, Chef And The Hiring Event
August Challenge 2016
Chef and Circle Run, A Good Problem, Maximum Grid, Chef and Round Run, Chef and Chocolate, Chef and His Garden
December Challenge 2016
Train Partner, Kth Max Subarray, Roses for Alexey, Our Base is Under Attack
May Challenge 2017
Chef and Sub Array , Gotham PD, Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences
Brazil