November Challenge 2014
Distinct Characters Subsequence
January Challenge 2015
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 Equality, Let us play with rank list, Chef and Strange Formula, Chef and Chain
March Challenge 2015
Chef and Notebooks, Devu and his Class, Sign Wave
April Challenge 2015
Chef and Interview, Broken Telephone
July Challenge 2015
Bread, Na2a and lucky stone, Chef and Cube
May Lunchtime 2016
Akhil And Colored Balls, Akhil And Random String
India