September Challenge 2016
Faded Palindromes, Chef and calculation, Chef and digits of a number
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
July Challenge 2017
Chef and Sign Sequences, Calculator , Whats in the Name
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Chef and a great voluntary Program, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Chef Hates Palindromes, Villages and Tribes, Chef goes Left Right Left, Periodic Palindrome Construction
December Challenge 2017
Total Diamonds, Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays
September Lunchtime 2017
Chef and Cook-Off Contests
January Challenge 2018
K-Concatenation, Partition the numbers, String Merging, Rectangle, Maximum Score
March Challenge 2018 DIV 1
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting
India