"That item is the whole point of the interview and is where Atlassian is looking for a solution to their current development needs." I did the test too and I see no intention to "steal your ideas", but just to give you some view on the routine tasks that you could be faced on your job. All these algorithms are well known and the solutions can be googled easily in 5 mins, so unless your name is Dijkstra, you have nothing to worry about :)