challenge for programmable calculators

[Katie Wasserman]

Quote:I was using the symmetry of abc(a+b+c) to bail out early for values ≥ 1000. We can do that since a ≤ b ≤ c.

Okay, I see the symmetry that you're using and the partial ordering. But I don't see why you don't need to test for the reverse digit ordering. For example, in 2 4 7 you test if 728 matches 247, but you don't test if 728 matches 742. In looking at the Python code, I don't see that test in there.

Am I still not understanding your speedup method or is there a bug in the code?