November Challenge 2014
Chef and Words, Chef and Segment Game, Let us construct palindrome, Chef and Red Black Tree, Distinct Characters Subsequence
December Challenge 2014
XOR with Subset, Chef and Apple Trees
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
January Lunchtime 2015
Just multiply, Piece of cake
February Challenge 2015
Chef and Chain, Time to Study Graphs with Chef, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Xor Matrix, Chef and Equality
March Challenge 2015
Count Substrings, Sign Wave, Devu and his Class, Chef and Notebooks
April Challenge 2015
Count Sequences, Chef and Interview, Broken Telephone, Chef and Piano Scales
India