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Comment by ginkgo | Hacker News Reader

The input set is problematic because it contains every number from 0 to VA.length exactly once.

This allows "algorithms" like this:

  for x in [0...VA.length]
    while (VA.get(x) > x)
      VA.swap(VA.get(x), x)

Its not a game; its a learning tool. It doesn't bother me that people can do that.

Also, that's not going to work quite right - the values are [1..VA.length] (see the bottom of the page), while the indices are [0...VA.length].