September Challenge 2013
Little Elephant and Exams, Cool Guys, Chef and Integers , CAO Stage-1, CAO Stage-2, Sereja and Snake
November Challenge 2013
Yet Another Cute Girl, Missing some chairs, Square Digit Squares, Uncle Johny, Superpowers of 2
December Lunchtime 2013
Perfect Subarrays, Mike and Task Packages, Mike and Matrices
July Challenge 2017
Chef and Sign Sequences, Two Coins, IPC Trainers, Calculator , Whats in the Name, Tree Expectancy, Pishty and tree
August Long Challenge 2017
Chef and Rainbow Array, Chef And Fibonacci Array, Chef and Mover, Palindromic Game, Greedy Candidates, Strings and Graphs
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function, Chang and Perfect Quadruples, Bipartite Graph from Trees
August Cook-Off 2018 Division 1
GukiZ and Candies, Mixi Game
Russia