November Challenge 2014
Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome, Chef and Segment Game
January Challenge 2015
One Dimensional Kingdoms, Gcd Queries, Xor Queries, Sereja and Votes, Chef and Stones, Chef and A Large Permutation, Sereja and Number Division 2, Queries on the String
May Challenge 2015
Devu and his three Hands, Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe, Chef and Cake
Indonesia