February Challenge 2017
Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
May Challenge 2017
Median of adjacent maximum numbers, Blocked websites, Courses in an university, Chef and his daily routine
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator , IPC Trainers
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Little Chef and Sums, Fill The Matrix, Chef and Pick Digit, Sereja and Commands, Minimum Good Permutation
October Challenge 2017
Chef and a great voluntary Program, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
November Challenge 2018 Division 2
Chef and Difficult Contests
India