November Challenge 2014
Distinct Characters Subsequence, Chef and Segment Game, Let us construct palindrome
January Challenge 2015
Queries on the String, Sereja and Number Division 2, Chef and A Large Permutation, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
February Challenge 2015
Chef and Chain, Chef and Strange Formula, Let us play with rank list, Chef and Equality
March Challenge 2015
Matrix, Sign Wave, Devu and his Class, Count Substrings, Chef and Notebooks
April Challenge 2015
Chef and Interview, Broken Telephone, Inversion sorting, Chef and Piano Scales
May Challenge 2015
Set Difference , Chef and new recipe, Chef and Prime Divisors, Devu and binary String
June Challenge 2015
Chef and Memory Limit, Chef and Polygons
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix
March Cook-Off 2015
How to Minimize a String, How to Repaint a Fence
August Cook-Off 2015
Chef and the Wildcard Matching
Ukraine