November Challenge 2017
Periodic Palindrome Construction, Villages and Tribes, Chef goes Left Right Left
December Challenge 2017
Total Diamonds, Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays
January Challenge 2018
Maximum Score, Rectangle, K-Concatenation
January Lunchtime 2018
Chef and Game with Sequence
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
March Challenge 2018 DIV 2
Chef and Easy Problem, Chef and Glove, Mix the Colors, A Big Sale
April Challenge 2018 Division 2
Chef and Array (Challenge), Weight of Numbers, Count Good Prefixes, Average of Pairs, Workers
February Challenge 2020 Division 2
Chef and Railway Stations, No Change Required, The Theatre Problem, School of Geometry, Hard Cash, (Challenge) Raisins, Long Contest and Cook Off Overlaps
India