Funny you should mention breadth first search - there was a post about hiring just a few days ago where the author was complaining about its used as an interview question: <a href="https:&#x2F;&#x2F;medium.com&#x2F;@evnowandforever&#x2F;f-you-i-quit-hiring-is-broken-bb8f3a48d324#.q36tqvpei" rel="nofollow">https:&#x2F;&#x2F;medium.com&#x2F;@evnowandforever&#x2F;f-you-i-quit-hiring-is-b...</a>