September Challenge 2017
Minimum Good Permutation, Little Chef and Sums, Chef and Pick Digit
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
January Challenge 2018
Partition the numbers, String Merging, Rectangle, Maximum Score, K-Concatenation
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
March Challenge 2018 DIV 2
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove
March Cook-off 2018 Division 2
Chef Goes to the Cinema, Chef Judges a Competition
June Challenge 2018 Division 2
Sheokand and String, Binary Shuffle, Naive Chef
India