March Challenge 2015
Chef and Notebooks, Chef and Problems, Devu and his Class, Sign Wave, Matrix, Counting on a Tree, Count Substrings
May Challenge 2015
Counting on a directed graph, Chef and Cake, Chef and new recipe, Set Difference , Chef and Prime Divisors, Devu and binary String
June Challenge 2015
Sereja and Matrix Division, Steady tables, Chef and His Friend, Chef and Memory Limit, Chef and Polygons, Chef and String
September Challenge 2015
Chain of Doughnuts, Nikitosh and xor, Count Steps in Matrix
December Challenge 2016
Train Partner, Kth Max Subarray, Kirito in labyrinth
Mexico