May Challenge 2017
Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Sub Array
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
July Challenge 2017
IPC Trainers, Calculator , Whats in the Name, Tree Expectancy, Chef and Sign Sequences
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
October Challenge 2017
Chef and Cycled Cycles, (Challenge) Connecting computers, A Balanced Contest, Counter Test For CHEFSUM, Chef and a great voluntary Program, Chef and Magic Arrays, Max Mex
November Challenge 2017
Chef and Intersection Line, Chef Hates Palindromes, Chef and Subarray Queries, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef And Easy Xor Queries, Chef and Hamming Distance of arrays, Penalty Shoot-out, Chef And his Cake, Total Diamonds, Chef and Universe
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
February Challenge 2018
Broken Clock, Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
India