fixed.

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In case it helps others, because "help, I have problem X! Nvm I figured it out" doesn't help someone with the same problem:

I don't undestand why we need to stack here if there is only one container to be loaded to ship A

Container A needs to be stacked because it needs to be taken off the railcar and put somewhere before the ship arrives. All the containers arrive before the first ship turns up.

Does the arrival order matter?

It is critical, and the string defines the order.

In this case, are the Cs on top of the Bs

No, the Bs end up on top of the Cs or next to them, depending on your stacking choices. In "CCCBBB", 3 Cs arrive first, then 3 Bs arrive. Your crane removes a C from the railcar and puts it somewhere, then it removes another C, then another, then it removes a B. That B could go on top of a C, because ship B will turn up before ship C, meaning the crate B can be lifted and placed on ship B before there is any demand for any crate C

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Approved by someone

approved

Indeed

added.

See issues above

cheers

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