May Challenge 2014
Chef-jumping, Stone, Compilers and Parsers
September Challenge 2015
Chain of Doughnuts, Nikitosh and xor, Count Steps in Matrix, Bank robbery, Lighthouses
October Challenge 2015
Count Subarrays, Rupsa and Equilateral Triangle, Spheres, Who dares to be a millionaire, Time measure
November Challenge 2015
Receipt Recovery, Chef and collection of stamps
March Challenge 2018 DIV 2
A Big Sale, Minion Chef and Bananas, Minions and Voting, Chef and Glove, Mix the Colors, Chef and Easy Problem, Pishty and Triangles
April Challenge 2018 Division 1
Cutting Plants, Count Good Prefixes
November Challenge 2019 Division 2
Physical Exercise, Hard Sequence, Single Point of Failure, Weapon Value, Chef and Minimum Colouring
December Challenge 2019 Division 2
Chefina and Ranges, Plus Multiply, Binary XOR, Easy Subsequence Selection, That Is My Score!, Addition
Mongolia