February 2013 Challenge
Climbing Stairs, Buy1-Get1
July Challenge 2013
Chef and Walking on the rectangle , Count K-Primes
June Challenge 2014
Chef and Subarray, Guessing Game
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
February Challenge 2017
Chef and His Apartment Dues
April Challenge 2017
Dish Of Life, Similar Dishes
