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
Whats in the Name, Two Coins, IPC Trainers, Calculator , Servers (Challenge), Tree Expectancy, Multiplication Program, Pishty and tree, Irrational Root, Chef and Sign Sequences
December Challenge 2017
Chef and Universe, Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Chef and Hamming Distance of arrays
Taiwan