Problem You've spent over half your post describing your solution for a minimal version of your problem, that doesn't scale. But you haven't actually state what the problem is.

For example. You've told us that you've a 2d array of integers; that those integers range between 1 & 3e6 (twice) ; and there are ~50000 in each inner array.

But you fail to say how big the main array is?

Or what you need to look up. Ie. what do you start with; and what information do you need to end up with?

Or how many lookups you need to do?

And will you do these lookups once? Or once a week? Or once an hour?

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: Fast algorithm for 2d array queries by BrowserUk
in thread Fast algorithm for 2d array queries by baxy77bax

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