October Challenge 2015
Who dares to be a millionaire
November Challenge 2015
Eugene and function, Chef and cakes
December Challenge 2015
Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence
September Lunchtime 2015
Sum of palindromic numbers
February Challenge 2016
Chef and Strange Operations, Chef-Detective
March Challenge 2016
maximize the sum, Chef And Special Dishes, Palindromic substrings
April Challenge 2016
Chef and Ballons, Chef And Coloring
May Challenge 2016
Chef and Balls, Forest Gathering, Chef and Big Soccer, Laddu
June Challenge 2016
Chef and Array and K, Devu and an Array, Chef and Coins Game, Chef And The Hiring Event, Chef And Binary Operation
July Challenge 2016
Andrash and Stipendium, Chefland and Electricity
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
November Challenge 2016
Task for Alexey, Chef and squares
March Challenge 2017
Xenny and Alternating Tasks
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
India