Tài liệu Thuật toán Algorithms (Phần 17) pptx

... the internal methods that we’ve been studying). There are two major factors which make external algorithms quite differ- ent from those we’ve seen until now. l’irst, the cost of accessing an item is ... for external sorting, the “s:istems” aspect of the problem is cer- tainly as important as the algorithms .ispect. Both areas must be carefully considered if an effective external sort...

Ngày tải lên: 21/01/2014, 17:20

... interesting algorithms that we will encounter are based on the divide-and-conquer technique of combining the solutions of recursively solved smaller subproblems. The running time of such algorithms ... out that this holds true (roughly) for all N, and we have the solution M(N) We’ll see several algorithms from different applications areas whose perfor- mance characteristics are describ...

Ngày tải lên: 24/12/2013, 11:15

... by moving all the elements in at least one of them to a large array. It is easy to translate the algorithms we have been examining to use linked representations; in fact, sometimes there are other

Ngày tải lên: 24/12/2013, 11:15

... rotation operation is defined on any binary search tree and is the basis for several balanced tree algorithms. It is important to note, however, that doing a single rotation doesn’t necessarily improve ... a logarithmic number of steps for all searches and insertions. This is one of the few searching algorithms with that property, and its use is justified whenever bad worst-case performanc...

Ngày tải lên: 21/01/2014, 17:20

... of instructions executed when a Patricia tree is built from N random keys. 18. External Searching Searching algorithms appropriate for accessing items from very large files are of immense practical impcrtance. ... are expected to return a large number of records. In later chapters we’ll see some examples of algorithms which are appropriate for some search requests of this type, but genera...

Ngày tải lên: 21/01/2014, 17:20

... This makes the method convenient for use on a large file being read in from some external device. (Algorithms which require backup require some complicated buffering in this situation.) Boyer-Moore

Ngày tải lên: 26/01/2014, 14:20

... part, the algorithms that we have studied have been de- signed primarily to use as little time as possible and only secondarily to conserve space. In this section, we’ll examine some algorithms

Ngày tải lên: 26/01/2014, 14:20

... of “two-dimensional sort” because frequent parallels to sorting algorithms arise in the study of algorithms for finding the convex hull. In fact, the algorithms that we’ll study show that finding the convex ... do. For all of the algorithms that we consider, it is convenient to do the computation in place: the array used for the original point set is also used to hold the output. The...

Ngày tải lên: 26/01/2014, 14:20

... 227. Matching, 443-452, 454. match (general regular-expres- sion pattern matching), 265. Mathematical algorithms, 23-88. Mathematical programming, 497. Matrices. addition, 28-29 (matradd). band, 64. chain ... recursive), 145. Selection sort, 95 (selection), 144, 326. Self-organizing search, 175. Seminumerical algorithms, 88. Sentinel, 106, 173, 273, 309, 329, 96, 247, 254, 493. Separate cha...

Ngày tải lên: 15/12/2013, 02:16

... useful algorithms. The book consists of forty chapters which are grouped into seven major parts: mathematical algorithms, sorting, searching, string processing, geomet- ric algorithms, graph algorithms ... . . Algorithms, Outline of Topics 1. Preview. . . . . . . . . . . . . . . . . . . . . . . Pascal, Euclid’s Algorithm, Recursion, Analysis of Algorithms Implementing Algorithms MA...

Ngày tải lên: 15/12/2013, 02:16