Merge Algorithm
Merge algorithms are a family of algorithms that run sequentially over multiple sorted lists, typically producing more sorted lists as output. This is well-suited for machines with tape drives. Use has declined due to large random access memories, and many applications of merge algorithms have faster alternatives when a random-access memory is available.
The general merge algorithm has a set of pointers p0..n that point to positions in a set of lists L0..n. Initially they point to the first item in each list. The algorithm is as follows:
While any of p0..n still point to data inside of L0..n instead of past the end:
- do something with the data items p0..n point to in their respective lists
- find out which of those pointers points to the item with the lowest key; advance one of those pointers to the next item in its list
Read more about Merge Algorithm: Analysis, Language Support, Parallel Merge
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