July Challenge 2017
Two Coins, Pishty and tree
November Challenge 2017
Product on the segment by modulo , Chef Hates Palindromes, Polynomials, Chef and Subarray Queries, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef And Easy Xor Queries
October Cook-Off 2017
Chef and Counting Test, Chef and Dancing Steps, Chef and Weird Queries, Chef and Employment Test
June Lunchtime 2017
Maximum Unique Segment, Two Numbers, Company and Club Hierarchies
September Lunchtime 2017
Chef and Dice, Chef and Cook-Off Contests
October Lunchtime 2017
Buggy Calculator, Maximum Number
Laos