Find longest concatenated word in list of words.
This was a programming problem given to a friend of mine when he applied for a job.
I played around with the problem a bit to see how I might use range/v3. It's sort of half assed in that respect.
Looking at the memory use and runtime of this program got me looking at alternate sets and maps; that's how I found https://github.com/Tessil.
I have also included his program.