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Hang on mate!
From the suggestions given, they are ALL understandable - even by me - who you know nothing about (except I'm not a c++ programmer).
And if you want to replace your "clever" tag, try...

Thanks GReaper. That'll work.

Thanks very much for your reply. That sounds complicated to me, and sounds like it's above the level she's expected to be at.
I wonder if we're overthinking this problem, as I'm thinking it should...

Well obviously I can't help her which is why I asked here, and I'm not a threat to her independent problem solving. But if I could just drop a hint or two to get her on the right track, she'd still...

Hi
Yes, this is a homework question, but not my homework. I'm trying to help a friend.

The problem is complicated to describe.
There is a file which contains geographic location data (longitude,...