November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes, Product on the segment by modulo
December Challenge 2017
Red and blue points, Chef and Hamming Distance of arrays, Penalty Shoot-out, Chef And his Cake, Total Diamonds, Chef and Universe
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
(Challenge) Biased Committee, Permutation and Palindrome, Car-pal Tunnel, Chef And The Patents, Chef And His Characters, Broken Clock, Points Inside A Polygon
April Challenge 2018 Division 1
Chef and Array (Challenge), Cutting Plants, Highway Crossing, Chef and Same Old Recurrence, Count Good Prefixes, Average of Pairs
August Challenge 2018 Division 1
Coordinate Compression , Modular GCD
September Challenge 2018 Division 1
Sasha and Photos, Bad Shuffle, Table Game, Chef and Condition Zero (Challenge)
February Challenge 2019 Division 1
Manhattan Rectangle, Guess It Right, Chef and Secret Ingredients, Xor Decomposition, Yet Another Tree Problem, (Challenge) Chef with Orchestra in the Kitchen, Art of Balance, Maximize the Tax
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