第九章程序排序（The ninth chapter, program sorting）.docVIP

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第九章程序排序（The ninth chapter, program sorting）.doc

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第九章程序排序（The ninth chapter, program sorting）

第九章程序排序（The ninth chapter, program sorting） 9.4 application questions 1. what is the internal sorting? What is external sorting? What sort of sorting method is stable? What sort of ranking method is unstable? [] in answer ranking is sort in the sorting process all the data in the memory of the sort, without the need for internal and external data transfer in the sorting process, determine the ranking method of time performance is mainly mobile number comparison and data object data sorting code. External sorting is the amount of data involved in sorting during the sorting process, too much to hold in memory, so sorting is necessary to keep the information stored internally and externally during sorting. Assume that there is in the unsorted files in two or more than two records with the same key, if using a ranking method, which has the same keyword record remained unchanged in order before and after the relative order, the ranking method is stable, otherwise that the ranking method is not stable. 2. bubble sort algorithm is stable? Why? [answer] bubble sort algorithm is stable. Because the basis of the basic idea of the algorithm, the sorting process only two adjacent recording words, if the exchange record only in between two adjacent records, so that does not appear in the exchange process across multiple recording situations. The exchange of adjacent records does not occur even when two adjacent record keys are compared at the same time. Therefore, the bubble sort method does not change the relative order of the same key record, so it is stable. 3. in the bubble sorting process, in which case the sorting code moves toward the opposite direction of the sort, try to illustrate. Is there such a phenomenon in the quick sorting process? [answer] if the sort of code followed by the sort sequence is smaller than the previous sort code, the sort code may move in the direction opposite to the position in which it should be moved in the process of bubbling sorting. Such as