package edu.princeton.cs.algs4;
import edu.princeton.cs.introcs.*;
/*************************************************************************
* Compilation: javac LRS.java
* Execution: java LRS < file.txt
* Dependencies: StdIn.java SuffixArray.java
* Data files: http://algs4.cs.princeton.edu/63suffix/tinyTale.txt
* http://algs4.cs.princeton.edu/63suffix/mobydick.txt
*
* Reads a text string from stdin, replaces all consecutive blocks of
* whitespace with a single space, and then computes the longest
* repeated substring in that text using a suffix array.
*
* % java LRS < tinyTale.txt
* 'st of times it was the '
*
* % java LRS < mobydick.txt
* ',- Such a funny, sporty, gamy, jesty, joky, hoky-poky lad, is the Ocean, oh! Th'
*
* % java LRS
* aaaaaaaaa
* 'aaaaaaaa'
*
* % java LRS
* abcdefg
* ''
*
*************************************************************************/
public class LRS {
public static void main(String[] args) {
String text = StdIn.readAll().replaceAll("\\s+", " ");
SuffixArray sa = new SuffixArray(text);
int N = sa.length();
String lrs = "";
for (int i = 1; i < N; i++) {
int length = sa.lcp(i);
if (length > lrs.length()) {
// lrs = sa.select(i).substring(0, length);
lrs = text.substring(sa.index(i), sa.index(i) + length);
}
}
StdOut.println("'" + lrs + "'");
}
}
/*************************************************************************
* Copyright 2002-2012, Robert Sedgewick and Kevin Wayne.
*
* This file is part of algs4-package.jar, which accompanies the textbook
*
* Algorithms, 4th edition by Robert Sedgewick and Kevin Wayne,
* Addison-Wesley Professional, 2011, ISBN 0-321-57351-X.
* http://algs4.cs.princeton.edu
*
*
* algs4-package.jar is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* algs4-package.jar is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with algs4-package.jar. If not, see http://www.gnu.org/licenses.
*************************************************************************/