February Challenge 2017
Chef and His Apartment Dues
June Challenge 2017
A Good Set, Xenny and Coin Rankings
July Challenge 2017
Chef and Sign Sequences, Whats in the Name
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
A Balanced Contest, Counter Test For CHEFSUM, Chef and a great voluntary Program, Max Mex
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
September Cook-Off 2017
Subsequence Equality, Statistics Construction, Infinite OR Game
December Cook-Off 2017
Beautiful Array, Football Match
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
India