March Challenge 2013
Tourist Translations, Fire Escape Routes, Random decreasing function
May Challenge 2014
Little Elephant and Balloons, Compilers and Parsers, Chef-jumping, Chef and Strange Matrix, Stone
June Challenge 2014
Guessing Game, Chef and Subarray, Chef and Digit Jumps
December Challenge 2014
XOR with Subset, Chef and Apple Trees
June Challenge 2017
Chef and Prime Queries, A Good Set, Chef and the Feast, Xenny and Coin Rankings, Pairwise union of sets
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator , IPC Trainers
Vietnam