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One example application of the double-ended priority queue is external sorting.
External sorting explains how merge sort is implemented with disk drives.
Merge sort is used in external sorting; heapsort is not.
Tournament replacement selection sorts are used to gather the initial runs for external sorting algorithms.
It is used for external sorting.
External sorting typically uses a sort-merge strategy.
External sorting is a term for a class of sorting algorithms that can handle massive amounts of data.
One example of external sorting is the external merge sort algorithm, which sorts chunks that each fit in RAM, then merges the sorted chunks together.
External merge sort is not the only external sorting algorithm; there are also distribution sorts, which work by partitioning the unsorted values into smaller "buckets" that can be sorted in main memory.
External sorting is required when the data being sorted do not fit into the main memory of a computing device (usually RAM) and instead they must reside in the slower external memory (usually a hard drive).