September Challenge 2016
Faded Palindromes, Chef and digits of a number
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Pairwise union of sets
July Challenge 2017
Chef and Sign Sequences, Calculator , Whats in the Name
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Little Chef and Sums, Chef and Pick Digit, Fill The Matrix, Minimum Good Permutation, Sereja and Commands
October Challenge 2017
Chef and a great voluntary Program, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
December Challenge 2017
Total Diamonds, Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays
December Lunchtime 2017
Days in Month, Strange Function
Bangladesh