June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets, Chef and Prime Queries
July Challenge 2017
Chef and Sign Sequences, Pishty and tree, Whats in the Name, Servers (Challenge), Calculator , IPC Trainers
December Cook-Off 2017
Beautiful Array, Football Match, Minimum SubArray
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging
February Challenge 2018
Broken Clock, Chef And His Characters, Chef And The Patents, Chef and odd queries, Points Inside A Polygon, Car-pal Tunnel, Permutation and Palindrome
Hong Kong (SAR)