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68 lines
2.0 KiB
Java
68 lines
2.0 KiB
Java
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import edu.princeton.cs.introcs.In;
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import edu.princeton.cs.introcs.StdIn;
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import edu.princeton.cs.introcs.StdOut;
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/*************************************************************************
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* Compilation: javac Whitelist.java
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* Execution: java Whitelist whitelist.txt < data.txt
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* Dependencies: StaticSetOfInts.java In.java StdOut.java
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*
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* Data files: http://algs4.cs.princeton.edu/11model/tinyW.txt
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* http://algs4.cs.princeton.edu/11model/tinyT.txt
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* http://algs4.cs.princeton.edu/11model/largeW.txt
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* http://algs4.cs.princeton.edu/11model/largeT.txt
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*
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* Whitelist filter.
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*
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*
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* % java Whitelist tinyW.txt < tinyT.txt
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* 50
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* 99
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* 13
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*
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* % java Whitelist largeW.txt < largeT.txt | more
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* 499569
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* 984875
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* 295754
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* 207807
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* 140925
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* 161828
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* [367,966 total values]
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*
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*************************************************************************/
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/**
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* The Whitelist class provides a client for reading in
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* a set of integers from a file; reading in a sequence of integers
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* from standard input; and printing to standard output those
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* integers not in the whitelist.
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*
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* For additional documentation, see Section 1.2</a> of
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* Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.
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*
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* @author Robert Sedgewick
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* @author Kevin Wayne
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*/
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public class Whitelist {
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/**
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* Reads in a sequence of integers from the whitelist file, specified as
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* a command-line argument. Reads in integers from standard input and
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* prints to standard output those integers that are not in the file.
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*/
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public static void main(String[] args) {
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In in = new In(args[0]);
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int[] white = in.readAllInts();
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StaticSETofInts set = new StaticSETofInts(white);
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// Read key, print if not in whitelist.
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while (!StdIn.isEmpty()) {
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int key = StdIn.readInt();
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if (!set.contains(key))
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StdOut.println(key);
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}
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}
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}
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