May Challenge 2015
Set Difference , Chef and new recipe, Chef and Prime Divisors
July Challenge 2015
Bread, Na2a and lucky stone, Chef and Cube
August Challenge 2015
Way Out, Gravity Guy, Cooking Machine, Aditi and Magic Trick
October Challenge 2015
Count Subarrays, Rupsa and Equilateral Triangle, Spheres, Who dares to be a millionaire, Time measure
May Cook-Off 2015
Devu and friendship testing
July Cook-Off 2015
Cops and the Thief Devu, Maximize Disjoint Pair Sum
June Lunchtime 2015
Chef and Submatrix, Chef and Two Strings
September Lunchtime 2015
Sum of palindromic numbers
India