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Merge sort - Wikipedia, the free encyclopedia
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Sort-merge join - Wikipedia, the free encyclopedia
The Sort-Merge Join (also known as Merge-Join) is an example of a join algorithm and is used in the implementation of a relational database management system. The basic problem of a join algorithm i...
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Merge-sort is based on the divide-and-conquer paradigm. The Merge-sort algorithm can be described in general terms as consisting of the following three steps: ... The heart of the Merge-sort algorithm is conquer step, which merge two sorted sequences into a single sorted sequence.
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Merge sort is a sorting algorithm invented by John von Neumann based on the divide and conquer technique. It always runs in time, but requires space. ... The general concept is that we first break the list into two smaller lists of roughly the same size, and then use merge sort recursively on the subproblems,
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Merge sort is the second guaranteed O(nlog(n)) sort we'll look at. Like heap sort, merge sort requires additional memory proportional to the size of the input for scratch space, but, unlike heap sort, merge sort is stable, meaning that "equal" elements are ordered the same once sorting is complete.
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54 end merge; 55 56 procedure mergesort (arr: in out sort_array; lower, upper: integer) 56 is 57 temp: sort_array; 58 begin 59 discrete i := 1 in 1..upper-lower+1 60 new i := i*4 61 loop 62 merge (arr, lower, upper, temp, i); ... The algorithm performs a bottom-up (i.e. non-recursive) merge sort.
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