It looks like Set::Infinite and Array::IntSpan could be helpful starting points.

If all the companies had mutually-exclusive ranges, then you could simply place them in an Array::IntSpan and look them up. But since your ranges intersect, you will need to intersect them with each other (using the operations of Set::Infinite like intersects and contains). That's basically what a tree algorithm would do.

In reply to Re: Re: Re: Code efficiency / algorithm by tall_man
in thread Code efficiency / algorithm by dave8775

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