March Challenge 2017
Bear and Extra Number, Xenny and Alternating Tasks
May Challenge 2017
Chef and his daily routine, Courses in an university
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings
August Long Challenge 2017
Chef and Rainbow Array, Palindromic Game
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
December Challenge 2017
Chef And his Cake, Chef and Hamming Distance of arrays, Penalty Shoot-out, Total Diamonds, Chef and Universe
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel
March Challenge 2018 DIV 2
Chef and Easy Problem, Minion Chef and Bananas, Minions and Voting, Mix the Colors, A Big Sale, Chef and Glove
March Cook-off 2018 Division 2
Chef Goes to the Cinema, Chef Restores a Matrix, Chef Judges a Competition
March Lunchtime 2018 Division 2 (Unrated)
Chef and Friends, Three Integers, Magic Elements
April Challenge 2018 Division 2
Average of Pairs, Workers, Count Good Prefixes, Weight of Numbers, Chef and Array (Challenge)
May Challenge 2018 Division 2
Mighty Friend, Change the Signs, Minimum Deletions, Xor Again, Fake Binary Search, Dibs on Fibs
December Challenge 2018 Division 1
(Challenge) Delete DAG, Max and Electrical Panel, Chef and Interactive XOR
India