Any ideas on How to search a 2D array quickly?

Posted by Tattat on Stack Overflow See other posts from Stack Overflow or by Tattat
Published on 2010-03-30T14:21:10Z Indexed on 2010/03/30 14:23 UTC
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I jave a 2D array like this, just like a matrix:

{{1, 2, 4, 5, 3, 6},
{8, 3, 4, 4, 5, 2},
{8, 3, 4, 2, 6, 2},
//code skips... ...

}

I want to get all the "4" position, instead of searching the array one by way, and return the position, how can I search it faster / more efficient? thz in advance.

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