June Challenge 2014
Maxim and Progressions, Little Elephant and Blocks, Forgot Password, Guessing Game, Two Companies, Chef and Digit Jumps, Chef and Functions, Chef and Subarray
July Challenge 2014
Dish Owner, Game of Numbers, Lucky Game, Reach The Point, Count Substrings, Chef and Rectangle Genome, Sereja and Equality, Chef and Frogs, Garden Game, Little Elephant and Painting
January Lunchtime 2014
Chef and Shop, Chef and String, Chef and Numbers, Chef and Way
March Lunchtime 2014
Nice SubSegments, Statements Checking
May Lunchtime 2014
Approximately II, Divisible Subset
June Lunchtime 2014
Substring Query, Coprime Triples, The Smallest Pair, Dynamic Inversion
September Challenge 2015
Chain of Doughnuts, Nikitosh and xor, Count Steps in Matrix, Bank robbery, Lighthouses
November Challenge 2015
Chef and collection of stamps, Chef and cakes, Simple Sum, Eugene and function, Receipt Recovery, Ingredients
July Challenge 2016
Andrash and Stipendium, Chef and Segments, Chef and Tetris, Chef and special numbers, Evaluate the polynomial, Chef and Robots Competition, Chefland and Electricity, Defend the Recipe, Scheduling jobs on a cluster
China