January Challenge 2015
Chef and Stones, Sereja and Votes
February Challenge 2015
Chef and Chain, Let us play with rank list, Chef and Equality
April Challenge 2015
Chef and Interview, Broken Telephone, Chef and Piano Scales
August Challenge 2015
Way Out, Gravity Guy, Cooking Machine, Aditi and Magic Trick
September Challenge 2015
Count Steps in Matrix, Chain of Doughnuts
October Challenge 2015
Count Subarrays, Who dares to be a millionaire
May Cook-Off 2015
Devu and friendship testing
September Lunchtime 2015
Sum of palindromic numbers
March Challenge 2016
Palindromic substrings, maximize the sum
April Challenge 2016
Chef and Ballons, Chef And Coloring
November Challenge 2018 Division 2
Chef and Difficult Contests
India