January Challenge 2018
Maximum Score, Rectangle, String Merging, Partition the numbers, K-Concatenation
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
March Challenge 2018 DIV 2
Minion Chef and Bananas, Minions and Voting, Chef and Glove, A Big Sale, Chef and Easy Problem, Pishty and Triangles, Mix the Colors
March Cook-off 2018 Division 1
Chef Goes to the Cinema, Chef Restores an Array, Chef Restores a Matrix
April Challenge 2018 Division 1
Chef and Array (Challenge), Count Good Prefixes, Highway Crossing, Cutting Plants
May Challenge 2018 Division 1
Change the Signs, Fake Binary Search, Dibs on Fibs
July Challenge 2018 Division 1
No Minimum No Maximum, Gears
Hungary