March Challenge 2017
Bear and Extra Number, Xenny and Alternating Tasks
April Challenge 2017
Similar Dishes, Dish Of Life
May Challenge 2017
Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences
June Challenge 2017
Chef and the Feast, Pairwise union of sets, Triplets, Xenny and Coin Rankings, A Good Set
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator
August Long Challenge 2017
Greedy Candidates, Palindromic Game, Chef and Rainbow Array, Chef and Mover
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
October Challenge 2017
A Balanced Contest, Counter Test For CHEFSUM, Max Mex, Chef and a great voluntary Program
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
March Challenge 2018 DIV 1
Chef and Easy Problem, Mix the Colors, Minions and Voting
India