April Challenge 2014
Chef and Digits, Shortest Path in Binary Trees, Farmer Feb
January Challenge 2015
Chef and Stones, Sereja and Votes, Gcd Queries
May Challenge 2015
Chef and new recipe, Set Difference , Chef and Prime Divisors
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix, Lighthouses
October Challenge 2015
Count Subarrays, Rupsa and Equilateral Triangle, Spheres, Who dares to be a millionaire, Time measure
March Challenge 2018 DIV 2
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minion Chef and Bananas
September Challenge 2018 Division 2
Magician versus Chef, Chef and Adventures
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
July Challenge 2020 Division 2
Ada King, Missing a Point, Chef and Card Game, Chef and Strings
Mongolia