I've had mixed reaction to this take home exercise. I've done that some 4 times and 3 of them resulted in getting called in for an onsite (Amazon). If problem is interesting and there's something to learn. I tend to go for it. But couple of them were lame. Neither it was a good use of my time, nor it was an indicative of my skills.

In near future, I'll be requesting exercises that can be treated and used as a micro library. They are free to use it and I get to post it on github.