March 2012 Challenge
Cosine Partition Function, Longest Weird Subsequence, Xor it, Spoon in Matrix, Home Delivery, Free Shuttle Service, Lucky Number, Evil Book
April Cook-Off 2012
Top Batsmen, Crease Painting, Resistance
July Challenge 2012
Favourite Numbers, Chef's Dream, My Fair Coins, The Gray-Similar Code, Little Elephant and Bubble Sort, Gift Rift, Restaurant Rating
August Challenge 2012
Delivery Boy, Lucky Driving, Little Elephant and Bombs, Range of Data
January Challenge 2015
Xor Queries, Gcd Queries, Ranka, One Dimensional Kingdoms, Sereja and Votes, Chef and Stones, Sereja and LCM, Chef and A Large Permutation, Sereja and Number Division 2, Queries on the String
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
