Five programming problems every Software Engineer should be able to solve in less than 1 hour

[Geoff Canyon]

On Sun, May 10, 2015 at 5:38 AM, Mark Waddingham <mark at livecode.com> wrote:

> ---- PROBLEM 5
> ----   At first sight this one seems 'scary' but in actual fact the
> ----   number of combinations is actually quite small (3^8) and you
> ----   can get them by counting from 0 to 3^8 in ternery and padding
> ----   the result to 8 digits. I then use 0 for no sign, 1 for + and
> ----   2 for -. Having 'value' makes checking the sums trivial.
>

I thought briefly about doing this but it didn't gel in my mind as quickly
as the substitution method I used. I quite like how this turned out!