November Challenge 2014
Chef and Red Black Tree, Chef and Segment Game
December Challenge 2014
XOR with Subset, Chef and Apple Trees
January Challenge 2015
Sereja and Votes, One Dimensional Kingdoms
August Challenge 2015
Cooking Machine, Chef and insomnia, Aditi and Magic Trick, Devu And Churu , Gravity Guy, Way Out
November Challenge 2015
Eugene and function, Chef and cakes
December Challenge 2015
Chef and the stones, Oracle Devu and Longest Common Subsequence
May Challenge 2020 Division 2
Coronavirus Spread, Isolation Centers
Finland