May Challenge 2017
Gotham PD, Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences, Chef and Sub Array
June Challenge 2017
Pairwise union of sets, Triplets, Xenny and Coin Rankings, Cloning, A Good Set, Chef and Prime Queries, Chef and the Feast
September Challenge 2017
Weasel does Xor on Tree, Little Chef and Sums, Fill The Matrix, Weasel finds Staircase, Sum of Cubes, Minimum Good Permutation, Chef and Pick Digit, Sereja and Commands
November Challenge 2017
Villages and Tribes, Periodic Palindrome Construction, Chef Hates Palindromes, Lovers Gift, Chef goes Left Right Left, Polynomials, Product on the segment by modulo , Chef and Intersection Line, Chef and Subarray Queries
June Cook-Off 2017
Ada and crayons, Knight Covering, SnackUp, Centeroid
October Cook-Off 2017
Chef and Weird Queries, Chef and Dancing Steps, Chef and Employment Test, Chef and Counting Test
April Lunchtime 2017
Bear and Digit Virus, Bear and Segments, Bear and Segment 01
June Lunchtime 2017
Maximum Unique Segment, Two Numbers, Company and Club Hierarchies
November Lunchtime 2017
Smart Strategy, Shuffling, L-R queries
Poland