I always keep an offline copy of the Javadocs on my laptops, and it's easy to do similarly for any other language of your choosing. If your problem is needing

I always keep an offline copy of the Javadocs on my laptops, and it's easy to do similarly for any other language of your choosing. If your problem is needing to look up algorithms, I'd say that copying and pasting from programming blogs and wikipedia is not a substitute for actually learning algorithms. With a very small amount of memorization and a larger amount of practice designing algorithms it can be quite easy to reinvent these techniques on the spot.