January Challenge 2015
Chef and A Large Permutation, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries, Queries on the String
January Long Challenge 2016
Devu and Perfume, Chef and Time Machine, Churu and Balls, Rupsa and the Game
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Weasel does Xor on Tree, Fill The Matrix, Little Chef and Sums
September Challenge 2019 Division 1
Biladerim Icin, Fuzzy Linear Combinations, Chef Designed a Network
Taiwan