January Long Challenge 2016
Chef and Time Machine, Devu and Perfume
February Challenge 2016
Chef and Strange Operations, Chef-Detective
March Challenge 2016
Sereja and Two Strings 2, Palindromic substrings, maximize the sum, Chef And Special Dishes
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
June Challenge 2016
Chef And The Hiring Event, Chef and Array and K, Chef And Binary Operation, Chef and Coins Game, Devu and an Array
July Challenge 2016
Andrash and Stipendium, Chef and Tetris, Chefland and Electricity
August Challenge 2016
Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and calculation, JosephLand, Faded Palindromes, Chef and Matrix Division, Dividing Machine, Chef and Friends, Chef and digits of a number
February Cook-Off 2016
Puppy and Catchers, Puppy and Sum
March Cook-Off 2016
Digital clock, Alternating subarray prefix
August Cook-Off 2016
Tweedle-Dee and Tweedle-Dum
January Challenge 2017
Reservior, Tourists in Mancunia, Cats and Dogs, Capital Movement, Chef and Circle
June Challenge 2017
Pairwise union of sets, Triplets, Xenny and Coin Rankings, Chef and the Feast, A Good Set, Chef and Prime Queries
December Cook-Off 2017
Beautiful Array, Football Match
June Lunchtime 2017
Maximum Unique Segment, Two Numbers
India