November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome
December Challenge 2014
Chef Under Pressure, Chef and Bracket-Pairs, XOR with Subset, Chef and Apple Trees
September Lunchtime 2014
Chef and easy problem, Chef and easy problem 2
January Challenge 2015
Gcd Queries, One Dimensional Kingdoms, Sereja and Votes, Chef and A Large Permutation, Sereja and Number Division 2, Queries on the String, Chef and Stones
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix, Lighthouses
November Challenge 2015
Eugene and function, Chef and cakes
March Challenge 2016
Palindromic substrings, Chef And Special Dishes, maximize the sum, Chef And Hungry Birds
July Challenge 2016
Andrash and Stipendium, Chef and Segments, Chef and Tetris, Chef and Robots Competition, Chefland and Electricity
July Cook-Off 2016
Chef and Proportion, Chef and Numbers
Ukraine