January Challenge 2015
Chef and Stones, Sereja and Votes
February Challenge 2015
Chef and Chain, Chef and Equality
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix
October Challenge 2015
Time measure, Count Subarrays, Who dares to be a millionaire
January Long Challenge 2016
Churu and Balls, Chef and Time Machine
March Challenge 2016
Palindromic substrings, maximize the sum
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
June Challenge 2016
Chef and Coins Game, Devu and an Array
July Challenge 2016
Andrash and Stipendium, Chefland and Electricity
September Challenge 2016
Faded Palindromes, Chef and calculation, Chef and digits of a number
October Challenge 2016
Chef and Keyboard, Chef and Three Dogs
July Cook-Off 2016
Chef and Proportion, Chef and Numbers
October Cook-Off 2016
Watson asks Does Permutation Exist, ChefWatson uses Social Network
February Challenge 2017
Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
June Challenge 2017
A Good Set, Xenny and Coin Rankings
July Challenge 2017
Whats in the Name, Calculator
June Lunchtime 2017
Maximum Unique Segment, Two Numbers
India