October Challenge 2016
Chef and Three Dogs, Chef and Keyboard
November Challenge 2016
Chef and squares, Task for Alexey
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, Bandwidth of a matrix
April Challenge 2017
Similar Dishes, Bear and Clique Distances, Dish Of Life, Stable market, Bear and Row 01
May Challenge 2017
Chef and Subsequences, Median of adjacent maximum numbers, Blocked websites, Courses in an university, Chef and his daily routine, Chef and Sub Array
June Challenge 2017
Chef and Prime Queries, A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
July Challenge 2017
Chef and Sign Sequences, IPC Trainers, Whats in the Name, Calculator
October Challenge 2017
Chef and a great voluntary Program, Max Mex, A Balanced Contest
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Chef and Hamming Distance of arrays
February Challenge 2018
Chef And His Characters, Chef And The Patents, Permutation and Palindrome
April Challenge 2018 Division 2
Cutting Plants, Weight of Numbers, Count Good Prefixes, Average of Pairs, Workers
June Challenge 2018 Division 2
Sheokand and String, Naive Chef
Kyrgyzstan