Listing source code in two columns

I’ve come across a document typeset in LaTeX which solves code listings in a way that I would be very happy to do in my document, but I can’t figure out how the author managed to do this in LaTeX. Does anyone know how one can list code in two columns as done in the example below, which package is used?

Listing source code in two columns

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Category: listings Time: 2016-07-31 Views: 2

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