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Ahhh. I didn't understand what you meant by "Both planks cannot be overlapping each other." I thought that meant the end points have to be the same, but instead two planks just have to include...

I'm starting to get it, and I don't see any complexity. I'm not sure which sort makes sense yet. You may want to group them by the same start/end values. In the four you've shown above, none...

I'm sure there's lots I'm not getting, but again you're focused on the format and and/or appearance of the data, considering it fixed/immutable/inflexible and driving the whole rest of the program. ...

You're focused on the visual representation of a Plank and seeing the problem from that limited (or limiting) perspective. The Plank can "look" however you want it to. That's what toString()...

I honestly don't understand the plank concepts you've presented, but even without complete understanding, it seems you could create a Plank class with the attributes start, end, and height. From...