December Challenge 2014
XOR with Subset, Chef and Apple Trees, Alok-nath and His Sanskars
January Challenge 2015
Sereja and Number Division 2, Chef and Stones, Sereja and Votes, Gcd Queries
February Challenge 2015
Let us play with rank list, Chef and Equality, Chef and Strings, Chef and Strange Formula, Chef and Chain
April Challenge 2015
Chef and Interview, Broken Telephone, Chef and Piano Scales
May Challenge 2015
Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe
November Lunchtime 2015
Query over Matrix, Black And White Cells
