June Challenge 2017
Chef and the Feast, Xenny and Coin Rankings, Triplets, A Good Set
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
November Challenge 2017
Chef goes Left Right Left, Villages and Tribes, Periodic Palindrome Construction, Chef and Subarray Queries, Chef Hates Palindromes
April Challenge 2018 Division 1
Chef and Array (Challenge), Highway Crossing, Count Good Prefixes
September Challenge 2018 Division 1
Magician versus Chef, War of XORs, Table Game, Bad Shuffle
Peru