June Challenge 2017
Chef and the Feast, Xenny and Coin Rankings, Pairwise union of sets, A Good Set
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
October Challenge 2017
A Balanced Contest, Max Mex
December Challenge 2017
Chef And his Cake, Penalty Shoot-out
December Cook-Off 2017
Beautiful Array, Football Match
February Challenge 2018
Chef And His Characters, Chef And The Patents, Permutation and Palindrome
India