December Challenge 2012
Book Exercises, Magic Rankings, Granama Recipes
March Challenge 2013
Tourist Translations, Approximately, Fire Escape Routes, Minesweeper
September Challenge 2013
Little Elephant and Exams, Cool Guys, Chef and Integers , Project Spoon, CAO Stage-1, CAO Stage-2
October Cook-Off 2013
Polo the Penguin and the Test
November Challenge 2013
Superpowers of 2, Yet Another Cute Girl, Sereja and Vectors, Uncle Johny, Square Digit Squares, Missing some chairs
December Challenge 2013
Chef and Codes, Funny Marbles, Magic Pairs, Reign
January Challenge 2014
Chef and Feedback, Sereja and Graph, Please like me, Magic Trick, Bon Appetit
May Cook-Off 2014
Substrings and Repetitions, Divide the Cake, Ups and Downs
February Challenge 2014
Make Him Happy, Longest Common Pattern, Little Elephant and Subarrays
April Challenge 2014
Counting Matrices, Farmer Feb, Chef and Digits, Shortest Path in Binary Trees
May Challenge 2014
Compilers and Parsers, Stone, Chef and Strange Matrix, Chef-jumping
May Challenge 2015
Chef and Prime Divisors, Set Difference , Chef and new recipe
October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest
Ukraine