October Challenge 2017
A Balanced Contest, Max Mex
November Challenge 2017
Chef goes Left Right Left, Villages and Tribes
December Challenge 2017
Total Diamonds, Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays
January Challenge 2018
String Merging, Partition the numbers, Rectangle, Maximum Score, K-Concatenation
February Challenge 2018
Chef And His Characters, Chef And The Patents, Permutation and Palindrome
March Challenge 2018 DIV 2
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas
India