October Challenge 2013
Maxim and Dividers, Helping Lira
November Challenge 2013
Yet Another Cute Girl, Uncle Johny, Square Digit Squares, Missing some chairs, Superpowers of 2
December Challenge 2013
Chef and Codes, Funny Marbles, Magic Pairs
January Challenge 2014
Bon Appetit, Please like me, Chef and Feedback
October Cook-Off 2015
Almost Sorted Permutation
December Cook-Off 2015
Chef and Subarrays, Chef and Queries
March Challenge 2016
Palindromic substrings, maximize the sum
June Challenge 2016
Chef and Array and K, Chef And Binary Operation, Chef and Coins Game, Devu and an Array
July Challenge 2016
Chefland and Electricity, Chef and Tetris, Andrash and Stipendium, Chef and Robots Competition
August Challenge 2016
Chef and Circle Run, Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Sereja and Progressions, Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs
November Challenge 2016
Count Permutations, Task for Alexey, Chef and squares, Gift and Chef, Friends Meeting
December Challenge 2016
Train Partner, Kirito in labyrinth
June Lunchtime 2016
Collisions, One more weird game
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
United States