October Challenge 2014
Chef and Ground, Remy paints the fence, DevuLand, Dinosaurs and Laddus, Chef and Square, Magical Girl and Colored Liquid Potions
November Challenge 2014
Chef and Segment Game, Chef and Words, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome, The Spelling Problem
December Challenge 2014
Divide or die, Sereja and GCD, Chef and Apple Trees, XOR with Subset, Kali and Devtas, Chef and Bracket-Pairs, Alok-nath and His Sanskars, Chef Under Pressure
January Challenge 2015
Gcd Queries, Ranka, Xor Queries, One Dimensional Kingdoms, Chef and Stones, Sereja and LCM, Chef and A Large Permutation, Sereja and Number Division 2, Queries on the String, Sereja and Votes
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, Chef and Equality
March Challenge 2015
Chef and Notebooks, Count Substrings
May Challenge 2015
Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe, Chef and Cake
June Challenge 2015
Steady tables, Chef and His Friend, Chef and Memory Limit, Chef and Polygons, Anticommutative implication, Chef and String
India