### Abstract

We present an O(log(min(m,n,j))-time sequential algorithm to select the jth-smallest element of an array resulting from the merging of two sorted arrays A and B of sizes m and n. This algorithm is then used to design two parallel algorithms to partition A and B into p subarrays of size O( (m + n) p) in O( N p + log N) and O( N p + log p log N) times on crew pram and erew pram models with p processors, where N = m + n. A third parallel algorithm has been presented that partitions A and B in O( N p + log p log N) time into p pairs of subarrays of size O( N p) on erew pram with p processors without using any selection algorithm. Finally, these partitioning algorithms are used to obtain optimal parallel merging and sorting algorithms on crew prams and erew prams.

Original language | English (US) |
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Pages (from-to) | 151-161 |

Number of pages | 11 |

Journal | Information Sciences |

Volume | 56 |

Issue number | 1-3 |

DOIs | |

State | Published - Aug 1991 |

### ASJC Scopus subject areas

- Software
- Control and Systems Engineering
- Theoretical Computer Science
- Computer Science Applications
- Information Systems and Management
- Artificial Intelligence

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## Cite this

*Information Sciences*,

*56*(1-3), 151-161. https://doi.org/10.1016/0020-0255(91)90028-S