[Community Puzzle] Touching Balls - Puzzle discussion

Coding Games and Programming Challenges to Code Better

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Created by @Westicles,validated by @ManuelJ,@TelePario and @Harry.B.
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Hi,
I don’t understand what I have to do.Is it possible to have a simple but not trivial example ?

You have to expands the spheres as much as possible, like balloons.
Blow in the first one until it meets another one.
Then blow in the second one until…

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Thx, I was expanding each one by one at its turn

I don’t understand the result of the example. Where does this 370 come from? I would expect 343, as I find a difference of 6 between the two spheres.

You have to sum up all the r³, not only one.