Andrew,

these solutions are not guaranteeing the minimum. They are heuristical. 
Using one extra trunk is their normal behaviour. Look at the thesis 
mentioned earlier.

I tried to find the mathematically perfect solution, but it takes hours 
or years, to execute.

There has not been much conversation about this quiz. I think the reason 
was Ilmari's and Adam's excellent (and early) contributions. It was 
impossible to improve on them.

Christer

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