Introduction to Algorithms, Fourth Edition
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On Amazon, Kindle version is $84.99 and Hardcover is $121.50. Not to be released until March 22 though. https://www.amazon.com/dp/026204630X/
The difference between the 2nd and 3rd editions was miniscule besides renumbering the problems sets.
Is the pun intended?
Nope, not intended. Good spotting.