November Challenge 2014
Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome, Chef and Segment Game
January Challenge 2015
Chef and A Large Permutation, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms
October Challenge 2015
Count Subarrays, Who dares to be a millionaire
January Long Challenge 2016
Chef and Time Machine, Devu and Perfume
May Challenge 2016
Chef and math, Chef and Balls, Forest Gathering, Chef and Big Soccer, Laddu
June Challenge 2016
Chef And The Hiring Event, Devu and an Array, Chef And Binary Operation, Chef and Coins Game
September Challenge 2016
Chef and Friends, Dividing Machine, Chef and digits of a number, Faded Palindromes, Chef and calculation
February Cook-Off 2016
Puppy and Board, Puppy and Sum, Puppy and Catchers
October Cook-Off 2016
Sherlock and the Ugly Flower, Watson asks Does Permutation Exist, ChefWatson uses Social Network
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
India