September Challenge 2014
Factorisation, Chef and Rainbow Array - 2, Chef and Left-Right, Chef and sequence, Fun with Rotation
October Challenge 2014
Magical Girl and Colored Liquid Potions, DevuLand, Dinosaurs and Laddus, Chef and Square, Chef and Painting, Chef and Ground, Remy paints the fence
November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome, The Spelling Problem
January Challenge 2015
Gcd Queries, One Dimensional Kingdoms, Chef and Stones, Chef and A Large Permutation, Sereja and Number Division 2, Sereja and Votes
February Challenge 2015
Chef and Chain, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality
July Challenge 2015
Chef and Cube, Na2a and lucky stone
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix, Lighthouses
October Challenge 2015
Count Subarrays, Who dares to be a millionaire, Spheres
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
India