[PDF] [PDF] String Sorts - Algorithms

suffix arrays 5 1 STRING SORTS 3 String processing String Sequence of ・ Programming systems (e g , Java programs) ・ String data type in Java



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[PDF] String Sorts - Algorithms

suffix arrays 5 1 STRING SORTS 3 String processing String Sequence of ・ Programming systems (e g , Java programs) ・ String data type in Java



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Bentley and Sedgewick [3] employ a ternary-split Quicksort to the problem of sorting an array of strings, which results in the following algorithm: Start by 

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Summary of the performance of sorting algorithms

Frequency of operations.

49
algorithmguaranteerandomextra spacestable?operations on keys insertion sort½ N 2 N 2 1 ✔compareTo() mergesortN lg NN lg NN ✔compareTo() quicksort1.39 N lg N

1.39 N lg Nc lg N

compareTo() heapsort2 N lg N2 N lg N1 compareTo()

LSD sort

2 W (N + R)2 W (N + R)N + R

✔charAt()

MSD sort

2 W (N + R)N log

R

NN + D R

✔charAt()

3-way string

quicksort

1.39 W N lg R

1.39 N lg Nlog N + W

charAt() * probabilistic † fixed-length W keys ‡ average-length W keys http://algs4.cs.princeton.edu

ROBERT SEDGEWICK | KEVIN WAYNE

Algorithms

strings in Java key-indexed counting

LSD radix sort

MSD radix sort

3-way radix quicksort

suffix arrays

5.1 STRING SORTS

Given a text of N characters, preprocess it to enable fast substring search (find all occurrences of query string context). Applications. Linguistics, databases, web search, word processing, .... % more tale.txt it was the best of times it was the worst of times it was the age of wisdom it was the age of foolishness it was the epoch of belief it was the epoch of incredulity it was the season of light it was the season of darkness it was the spring of hope it was the winter of despair 51

Keyword-in-context search

Given a text of N characters, preprocess it to enable fast substring search (find all occurrences of query string context). Applications. Linguistics, databases, web search, word processing, .... % java KWIC tale.txt 15 search o st giless to search for contraband her unavailing search for your fathe le and gone in search of her husband t provinces in search of impoverishe dispersing in search of other carri n that bed and search the straw hold better thing t is a far far better thing that i do than some sense of better things else forgotte was capable of better things mr carton ent 52

Keyword-in-context search

characters of surrounding contextquotesdbs_dbs17.pdfusesText_23