[chbot] Choc Fish Challenge #5

[Synco Reynders]

Hi Mike,
I see you're a fit (or going to be a fit) guy after doing this... Cos
the next job your the boss has is a 300 wire cable <very subtle hint>
:-).
Nice try, but you may need a bit more optimisation.
/s

On 4 September 2011 21:44, Michael Field <hamster at snap.net.nz> wrote:
> I've made a start.... this is flawed (at the end of step 2 we haven't
> definitively identified the bundles at the far end) but might inspire
> somebody. My guess is that you need to use uneven wire counts in each bundle
> you can glean more information....
>
> But I'm pretty sure that the divide into three groups and wiring up two is
> the correct starting point...
>
> Mike
>
> First step
> Separate the cables into 3 bundles of 40, short all cables in the bundle
> together Connect each end of the battery terminals to one bundle of 40
> (leaving one bundle unconnected).
>
> Walk to the other end.
>
> Connect light to a random wire, and try to get a circuit by connecting to
> each of the other wires. If nothing lights, try another wire.
>
> When you get a light, you will then be able to move one jumper around to
> find which 39 other wires are also in that bundle. Do the same with the
> other terminal of the bulb.
>
> You will then have three bundles of 40. One you will be know more about
> (it's not connected at the other end) but you won't know which bundle is
> connected to the positive terminal, and which is to the negative (oh for an
> LED or meter).
>
> Second step
> For each bundle of 40, divide it into two sets of 20, and jumper together.
> Jumper two bundles of 20 from one of those connected to one of the battery
> terminals together, jumper each bundle of 20 from the unconnected pair to a
> bundle of 20 that is connected to the battery.
>
> Walk back to the other end
>
> Use the bulb in series with the battery to separate the starting end into 6
> bundles of 20.  you will also be able to work out which bundle was connected
> to which battery terminal, accurately identifying both ends of the bundle.
>
> Label each cable.
>
> Step 3 & 4
> Deal out the cables again 3 or 4 from each bundle of 20, into new bundles of
> 40. Repeat. The above process, walking another two trips
> This will allow you to divide the cables into 36 bundles of three or four.
>
> Step 5 & 6
> Deal out the cables again bundles of 3 or for , into new bundles of 40.
> Repeat. The above process, walking another two trips
> This will allow you to identify individual cables.
>
>
> On 4/09/2011 7:48 p.m., Synco Reynders wrote:
>
> As I was pulling through some wires today I remembered this classic
> challenge...
>
> A 120 wire cable has been laid firmly underground between two
> telephone exchanges located 1km apart.
> After the cable was laid it was discovered the individual wires are
> not labeled. There is no visual way of knowing which wire is which and
> thus connections at either end is not immediately possible.
> As trainee technician your boss has asked you to sort it out and
> identify / label the wires at both ends. You only have a battery and
> light bulb to test continuity and tape/pen for labeling the wires.
>
> What is the shortest distance in kilometers you will need to walk to
> correctly identify and label each wire?
>
>
>
>
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