What is the best way to create a sparse array in C++? *

Question I am working on a project that requires the manipulation of enourmous matrices, particularly pyramidal summation for a copula calcu...

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What's the safest way to iterate through the keys of a Perl hash? *

Question If I have a Perl hash with a bunch of (key, value) pairs, what is the preferred method of iterating through all the keys? I have h...

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