[elliottcarlson]

I have used various interview questions, including FizzBuzz, factorials and other questions, and I would say the success rate I saw was about 20%. My personal favorite question is to have someone write a shuffle function without using any built in randomization functions - however most people give up, and others can't follow simple directions and wrap their head around the problem. This particular question had more of a 5 to 10% success rate.

[iron_ball]

Do you meant that they can't use Array.shuffle() or Array.sort(<some built-in random function>)? Or that they don't get any external source of randomness, even a 0.0 - 1.0 float?

[elliottcarlson]

No built in functions such as the ones mentioned, and preferably no quick entropy generating methods that are obvious but that's not as important as not using the built in functions. Another requirement is that each run of the function has to truly be a reshuffle of the array so that it can't be predictable.

It's harder than it sounds, but I also don't expect a perfect answer - generally I just want to see how people think out of thee box to try and solve an odd problem.