June Challenge 2015
Chef and Polygons, Chef and Memory Limit
July Challenge 2015
Bread, Na2a and lucky stone, Chef and Cube
August Challenge 2015
Gravity Guy, Cooking Machine, Aditi and Magic Trick
September Challenge 2015
Lighthouses, Bank robbery, Count Steps in Matrix, Chain of Doughnuts
July Cook-Off 2015
Cops and the Thief Devu, Maximize Disjoint Pair Sum
August Cook-Off 2015
Chef and the XORed Number , Chef and the Wildcard Matching
October Cook-Off 2015
Almost Sorted Permutation
India