Hacker ethic term "hack" arose from MIT lingo, as the word had long been used to describe college pranks that MIT students would regularly devise. However, Levy's hacker ethic also has often been quoted out of context and misunderstood to refer to hacking as in breaking into computers, and so many sources incorrectly imply that it is describing the ideals of white-hat hackers. However, what Levy is talking about does not necessarily have anything particular to do with computer security, but addresses broader issues. The hacker ethic was described as a "new way of life, with a philosophy, an ethic and a
Prefix sum runs in linear time for integer keys that are smaller than the number of items, and is frequently used as part of radix sort, a fast algorithm for sorting integers that are less restricted in magnitude. List ranking, the problem of transforming a linked list into an array that represents the same sequence of items, can be viewed as computing a prefix sum on the sequence 1, 1, 1, ... and then mapping each item to the array position given by its prefix sum value; by combining list ranking, prefix sums, and Euler tours, many important problems on trees may