November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes, Chef Hates Palindromes
January Challenge 2018
(Challenge) Chef and Palindromes, K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
January Lunchtime 2018
Chef and Game with Sequence
February Cook-Off 2018
Chef and Cook-Off, Chef and Line
March Challenge 2018 DIV 2
Pishty and Triangles, Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas
Code Melange (Rated)
XD Subsequences, The Deadly Sin, Candy Love
Syria