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algs4 | Algorithms, 4th edition textbook code and libraries | Learning library

 by   kevin-wayne Java Version: Current License: GPL-3.0

 by   kevin-wayne Java Version: Current License: GPL-3.0

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kandi X-RAY | algs4 Summary

algs4 is a Java library typically used in Institutions, Learning, Education, Tutorial, Learning, Example Codes applications. algs4 has no bugs, it has no vulnerabilities, it has build file available, it has a Strong Copyleft License and it has medium support. You can download it from GitHub.
Algorithms, 4th edition textbook code and libraries
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • algs4 has a medium active ecosystem.
  • It has 6721 star(s) with 2506 fork(s). There are 403 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 11 open issues and 44 have been closed. On average issues are closed in 104 days. There are 3 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of algs4 is current.
algs4 Support
Best in #Learning
Average in #Learning
algs4 Support
Best in #Learning
Average in #Learning

quality kandi Quality

  • algs4 has 0 bugs and 0 code smells.
algs4 Quality
Best in #Learning
Average in #Learning
algs4 Quality
Best in #Learning
Average in #Learning

securitySecurity

  • algs4 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • algs4 code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
algs4 Security
Best in #Learning
Average in #Learning
algs4 Security
Best in #Learning
Average in #Learning

license License

  • algs4 is licensed under the GPL-3.0 License. This license is Strong Copyleft.
  • Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.
algs4 License
Best in #Learning
Average in #Learning
algs4 License
Best in #Learning
Average in #Learning

buildReuse

  • algs4 releases are not available. You will need to build from source code and install.
  • Build file is available. You can build the component from source.
  • Installation instructions are available. Examples and code snippets are not available.
algs4 Reuse
Best in #Learning
Average in #Learning
algs4 Reuse
Best in #Learning
Average in #Learning
Top functions reviewed by kandi - BETA

kandi has reviewed algs4 and discovered the below as its top functions. This is intended to give you an instant insight into algs4 implemented functionality, and help decide if they suit your requirements.

  • Simulates the simulation with the specified number of particles .
  • Splits this node into two trees .
  • Sets the segments .
  • Creates a digraph with a strong component c .
  • Returns a double array from the specified filename .
  • Ensures that a solution is valid .
  • Checks that all the edges are consistent .
  • Finds the closest pair of points in the given array .
  • Saves offscreen image .
  • Augments the residual

algs4 Key Features

Our original goal was to cover the 50 algorithms that every programmer should know. We use the word programmer to refer to anyone engaged in trying to accomplish something with the help of a computer, including scientists, engineers, and applications developers, not to mention college students in science, engineering, and computer science. The code is optimized for clarity, portability, and efficiency. While some of our implementations are as fast as (or faster than) their counterparts in java.util, our main goal is to express the core algorithmic ideas in an elegant and simple manner. While we embrace some advanced Java features (such as generics and iterators), we avoid those that interfere with the exposition (such as inheritance and concurrency).

Java Cannot Load Main Class Without Adding .java

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$ java -cp ".lift/algs4.jar;." RandomWord < coin.txt
$ java -cp ".lift/algs4.jar:." RandomWord < coin.txt
-----------------------
$ java -cp ".lift/algs4.jar;." RandomWord < coin.txt
$ java -cp ".lift/algs4.jar:." RandomWord < coin.txt

compareTo with objects returns a false while it is true

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public class MyBST {  

   private Object e;
  
   public MyBST(Object e) {
        this.e = e;
    }

    public Object getE(){
        return e;
    }
    
    @Override
    public int hashCode() {
        return Objects.hashCode(e);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!(obj instanceof MyBST))
            return false;
        MyBST me = (MyBST) obj;
        if (e == null) {
            if (me.e != null)
                return false;
        } else if (!e.equals(me.e))
            return false;
        return true;
    }
}

class MyBST<T extends Comparable<? super T>> implements Comparable<MyBST<T>>{

    private T e;

    public MyBST(T e){
        this.e = e;
    }

    public T getE(){
        return e;
    }
    
    @Override
    public int compareTo(MyBST<T> o) {
        return e.compareTo(o.e);    
    }
}

class Apple {
    String type;
    int weight;
}

class MyBST implements Comparable<MyBST> {
    
    private Apple apple;
    
    public MyBST(Apple apple) {
        this.apple = apple;
    }
    
    @Override
    public int compareTo(MyBST e) {
        // this could be different depending on how you wanted
        // to compare one apple to another. This comparison favors
        // type over weight.

        // check type - String class implements comparable
        int ret = apple.type.compareTo(e.apple.type);
        if (ret != 0) { 
            return ret;
        }
        
        // same type so check weight
        if (apple.weight < e.apple.weight) {
            return -1;
        }
        if (apple.weight > e.apple.weight) {
            return 1;
        }
        return 0;  // equals apples based on criteria
    }
}

    private Object getE(){
        return e;
    }
-----------------------

public class MyBST {  

   private Object e;
  
   public MyBST(Object e) {
        this.e = e;
    }

    public Object getE(){
        return e;
    }
    
    @Override
    public int hashCode() {
        return Objects.hashCode(e);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!(obj instanceof MyBST))
            return false;
        MyBST me = (MyBST) obj;
        if (e == null) {
            if (me.e != null)
                return false;
        } else if (!e.equals(me.e))
            return false;
        return true;
    }
}

class MyBST<T extends Comparable<? super T>> implements Comparable<MyBST<T>>{

    private T e;

    public MyBST(T e){
        this.e = e;
    }

    public T getE(){
        return e;
    }
    
    @Override
    public int compareTo(MyBST<T> o) {
        return e.compareTo(o.e);    
    }
}

class Apple {
    String type;
    int weight;
}

class MyBST implements Comparable<MyBST> {
    
    private Apple apple;
    
    public MyBST(Apple apple) {
        this.apple = apple;
    }
    
    @Override
    public int compareTo(MyBST e) {
        // this could be different depending on how you wanted
        // to compare one apple to another. This comparison favors
        // type over weight.

        // check type - String class implements comparable
        int ret = apple.type.compareTo(e.apple.type);
        if (ret != 0) { 
            return ret;
        }
        
        // same type so check weight
        if (apple.weight < e.apple.weight) {
            return -1;
        }
        if (apple.weight > e.apple.weight) {
            return 1;
        }
        return 0;  // equals apples based on criteria
    }
}

    private Object getE(){
        return e;
    }
-----------------------

public class MyBST {  

   private Object e;
  
   public MyBST(Object e) {
        this.e = e;
    }

    public Object getE(){
        return e;
    }
    
    @Override
    public int hashCode() {
        return Objects.hashCode(e);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!(obj instanceof MyBST))
            return false;
        MyBST me = (MyBST) obj;
        if (e == null) {
            if (me.e != null)
                return false;
        } else if (!e.equals(me.e))
            return false;
        return true;
    }
}

class MyBST<T extends Comparable<? super T>> implements Comparable<MyBST<T>>{

    private T e;

    public MyBST(T e){
        this.e = e;
    }

    public T getE(){
        return e;
    }
    
    @Override
    public int compareTo(MyBST<T> o) {
        return e.compareTo(o.e);    
    }
}

class Apple {
    String type;
    int weight;
}

class MyBST implements Comparable<MyBST> {
    
    private Apple apple;
    
    public MyBST(Apple apple) {
        this.apple = apple;
    }
    
    @Override
    public int compareTo(MyBST e) {
        // this could be different depending on how you wanted
        // to compare one apple to another. This comparison favors
        // type over weight.

        // check type - String class implements comparable
        int ret = apple.type.compareTo(e.apple.type);
        if (ret != 0) { 
            return ret;
        }
        
        // same type so check weight
        if (apple.weight < e.apple.weight) {
            return -1;
        }
        if (apple.weight > e.apple.weight) {
            return 1;
        }
        return 0;  // equals apples based on criteria
    }
}

    private Object getE(){
        return e;
    }
-----------------------

public class MyBST {  

   private Object e;
  
   public MyBST(Object e) {
        this.e = e;
    }

    public Object getE(){
        return e;
    }
    
    @Override
    public int hashCode() {
        return Objects.hashCode(e);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!(obj instanceof MyBST))
            return false;
        MyBST me = (MyBST) obj;
        if (e == null) {
            if (me.e != null)
                return false;
        } else if (!e.equals(me.e))
            return false;
        return true;
    }
}

class MyBST<T extends Comparable<? super T>> implements Comparable<MyBST<T>>{

    private T e;

    public MyBST(T e){
        this.e = e;
    }

    public T getE(){
        return e;
    }
    
    @Override
    public int compareTo(MyBST<T> o) {
        return e.compareTo(o.e);    
    }
}

class Apple {
    String type;
    int weight;
}

class MyBST implements Comparable<MyBST> {
    
    private Apple apple;
    
    public MyBST(Apple apple) {
        this.apple = apple;
    }
    
    @Override
    public int compareTo(MyBST e) {
        // this could be different depending on how you wanted
        // to compare one apple to another. This comparison favors
        // type over weight.

        // check type - String class implements comparable
        int ret = apple.type.compareTo(e.apple.type);
        if (ret != 0) { 
            return ret;
        }
        
        // same type so check weight
        if (apple.weight < e.apple.weight) {
            return -1;
        }
        if (apple.weight > e.apple.weight) {
            return 1;
        }
        return 0;  // equals apples based on criteria
    }
}

    private Object getE(){
        return e;
    }

How to save permutation in a Set Java

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...
        for (int i = 0; i < tes.toArray().length; i++) {
            Integer key = it.next();
            bst1.put(key, 0);
        }
        Set<Stack<Integer>> combos = combos(tes, stack, tes.size()); //there you have set with all Stacks
    }
}

    public static Set<Stack<Integer>> combos(Set<Integer> items, Stack<Integer> stack, int size) {
    Set<Stack<Integer>> set = new HashSet<>();

    if(stack.size() == size) {
        System.out.println(stack.to);
        set.add((Stack) stack.clone());
    }

    Integer[] itemz = items.toArray(new Integer[0]);
    for(Integer i : itemz) {
        stack.push(i);
        items.remove(i);
        set.addAll(combos(items, stack, size));
        items.add(stack.pop());
    }
    return set;
}

How to show top to bottom leaks in my path

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public class AssignmentTwo {
    public static void main(String[] args) {
        int n      = 500;
        double p   = 0.60;

        StdDraw.enableDoubleBuffering();
        boolean[][] open = Percolation.random(n, p);
        StdDraw.clear();
        StdDraw.setPenColor(StdDraw.PINK);
        Percolation.show(open, false);
        StdDraw.setPenColor(StdDraw.BLACK);
        StdDraw.show();
        StdDraw.disableDoubleBuffering();
         boolean[][] full = Percolation.flow(open);
         Percolation.show(full, true);
    }
}

How to count number of edges between red and white nodes in a graph?

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    private int countEdges(Graph G, int[] rednodes) {
        int count = 0;
        Arrays.sort(rednodes);
        for ( int rednode : rednodes ) {
            for ( int adj : G.adj(rednode) ) {
                if ( Arrays.binarySearch(rednodes, adj) < 0 ) {
                    count++;
                }
            }
            
        }
        return count;
    }

How to use read file from URI using C# in PowerShell line by line?

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# Set $f to point to the target file on the web
$f = 'https://algs4.cs.princeton.edu/15uf/tinyUF.txt'

# $wc to represent the WebClient
$wc = [System.Net.WebClient]::new()

# Create a stream object, using the .OpenRead method on $f
$stream = $wc.OpenRead($f)

# Create a reader of the stream using System.IO.StreamReader
$reader = [System.IO.StreamReader]($stream)

# ForEach-Object didn't play nice, so using while until it displays the last line of the file
while (-not($reader.EndOfStream)) {
    $line = $reader.ReadLine();
    $line
}

# Close the StreamReader
$reader.Close()

# Dispose of the WebClient
$wc.Dispose()

Ruby Heapsort: `sink': undefined method `&gt;' for nil:NilClass

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if !a[j + 1].nil? # check if there is a right child
 while n > 1
    swap(a, 1, n)
    n -= 1
    sink(a, 1, n)
 end
  def sink(a, k, n)
    while 2 * k <= n
      j = 2 * k # child

      if j + 1 <= n # check if there is a right child
        j += 1 if j > 1 && less(a, j, j + 1) # if left child less than right child
      end

      break if !less(a, k, j) # If parent greater than child break
      swap(a, k, j)
      k = j
    end
  end
-----------------------
if !a[j + 1].nil? # check if there is a right child
 while n > 1
    swap(a, 1, n)
    n -= 1
    sink(a, 1, n)
 end
  def sink(a, k, n)
    while 2 * k <= n
      j = 2 * k # child

      if j + 1 <= n # check if there is a right child
        j += 1 if j > 1 && less(a, j, j + 1) # if left child less than right child
      end

      break if !less(a, k, j) # If parent greater than child break
      swap(a, k, j)
      k = j
    end
  end
-----------------------
if !a[j + 1].nil? # check if there is a right child
 while n > 1
    swap(a, 1, n)
    n -= 1
    sink(a, 1, n)
 end
  def sink(a, k, n)
    while 2 * k <= n
      j = 2 * k # child

      if j + 1 <= n # check if there is a right child
        j += 1 if j > 1 && less(a, j, j + 1) # if left child less than right child
      end

      break if !less(a, k, j) # If parent greater than child break
      swap(a, k, j)
      k = j
    end
  end

parameterized test constructor of junit java error message: Test class should have exactly one public zero-argument constructor

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public SolverTest(Board board, int expectedNumberOfMoves) {
    this.board = board;
    this.expectedNumberOfMoves = expectedNumberOfMoves;
}
public SolverTest() {
}
@RunWith(Parameterized.class)
public class SolverTest {
    final static File folder = new File("C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\ModifiedTests");
    final static String destFolder = "C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\testresults";
    final static ArrayList<Object[][]> filesList = new ArrayList<>();
    final Object currentBoard = new Object();

    @Parameterized.Parameters
    public static Iterable<Object[][]> data() {
        String path = "";
        int counter = 0;
        for (final File fileEntry : folder.listFiles()) {
            //System.out.println("processing file: " + fileEntry.getName())
            counter++;
            if (counter == 20) break;
            path = destFolder + fileEntry;
            In in = new In(fileEntry.getAbsolutePath());
            int n = in.readInt();
            int moves = in.readInt();
            int[][] tiles = new int[n][n];
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    tiles[i][j] = in.readInt();
            Board b = new Board(tiles);
            Object[][] fileList = new Object[][]{{b, moves}};
            filesList.add(fileList);
        }
        return filesList;
    }

    @Parameterized.Parameter(0)
    public Board board;
    @Parameterized.Parameter(1)
    public int expectedNumberOfMoves;

    public SolverTest() {
    }


    @Test
    public void test() {
        assertEquals(expectedNumberOfMoves, new Solver(board).moves());
    }

}
-----------------------
public SolverTest(Board board, int expectedNumberOfMoves) {
    this.board = board;
    this.expectedNumberOfMoves = expectedNumberOfMoves;
}
public SolverTest() {
}
@RunWith(Parameterized.class)
public class SolverTest {
    final static File folder = new File("C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\ModifiedTests");
    final static String destFolder = "C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\testresults";
    final static ArrayList<Object[][]> filesList = new ArrayList<>();
    final Object currentBoard = new Object();

    @Parameterized.Parameters
    public static Iterable<Object[][]> data() {
        String path = "";
        int counter = 0;
        for (final File fileEntry : folder.listFiles()) {
            //System.out.println("processing file: " + fileEntry.getName())
            counter++;
            if (counter == 20) break;
            path = destFolder + fileEntry;
            In in = new In(fileEntry.getAbsolutePath());
            int n = in.readInt();
            int moves = in.readInt();
            int[][] tiles = new int[n][n];
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    tiles[i][j] = in.readInt();
            Board b = new Board(tiles);
            Object[][] fileList = new Object[][]{{b, moves}};
            filesList.add(fileList);
        }
        return filesList;
    }

    @Parameterized.Parameter(0)
    public Board board;
    @Parameterized.Parameter(1)
    public int expectedNumberOfMoves;

    public SolverTest() {
    }


    @Test
    public void test() {
        assertEquals(expectedNumberOfMoves, new Solver(board).moves());
    }

}
-----------------------
public SolverTest(Board board, int expectedNumberOfMoves) {
    this.board = board;
    this.expectedNumberOfMoves = expectedNumberOfMoves;
}
public SolverTest() {
}
@RunWith(Parameterized.class)
public class SolverTest {
    final static File folder = new File("C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\ModifiedTests");
    final static String destFolder = "C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\testresults";
    final static ArrayList<Object[][]> filesList = new ArrayList<>();
    final Object currentBoard = new Object();

    @Parameterized.Parameters
    public static Iterable<Object[][]> data() {
        String path = "";
        int counter = 0;
        for (final File fileEntry : folder.listFiles()) {
            //System.out.println("processing file: " + fileEntry.getName())
            counter++;
            if (counter == 20) break;
            path = destFolder + fileEntry;
            In in = new In(fileEntry.getAbsolutePath());
            int n = in.readInt();
            int moves = in.readInt();
            int[][] tiles = new int[n][n];
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    tiles[i][j] = in.readInt();
            Board b = new Board(tiles);
            Object[][] fileList = new Object[][]{{b, moves}};
            filesList.add(fileList);
        }
        return filesList;
    }

    @Parameterized.Parameter(0)
    public Board board;
    @Parameterized.Parameter(1)
    public int expectedNumberOfMoves;

    public SolverTest() {
    }


    @Test
    public void test() {
        assertEquals(expectedNumberOfMoves, new Solver(board).moves());
    }

}

`java myClass` not finding a .class file when `java myClass.java` does? (OpenJDK)

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// Linux or MacOS
java -cp ".:foo.jar" MyClass

// Windows
java -cp ".;foo.jar" MyClass

Resizing array when elements are more than 1/2 of his size

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    public void resize(int m) { 
        int[] temp = new int[m];  // <-- this is the new double-size of m
        for(int i=0; i<hashTable.length; i++) {
            temp[i] = hashTable[i];
        }
        hashTable = new int[m];
        for(int i=0; i<temp.length; i++) {  // <-- here we go too far
            hashing(temp[i]);
        }
    }
public void resize(int m) {
    int[] oldHash = hashTable;
    hashTable = new int[m];
    for(int i=0; i<oldHash.length; i++) {
        if (oldHash[i] != 0) {     // <-- don't hash empty slots
            hashing(oldHash[i]);
        }
    }
}
-----------------------
    public void resize(int m) { 
        int[] temp = new int[m];  // <-- this is the new double-size of m
        for(int i=0; i<hashTable.length; i++) {
            temp[i] = hashTable[i];
        }
        hashTable = new int[m];
        for(int i=0; i<temp.length; i++) {  // <-- here we go too far
            hashing(temp[i]);
        }
    }
public void resize(int m) {
    int[] oldHash = hashTable;
    hashTable = new int[m];
    for(int i=0; i<oldHash.length; i++) {
        if (oldHash[i] != 0) {     // <-- don't hash empty slots
            hashing(oldHash[i]);
        }
    }
}

Community Discussions

Trending Discussions on algs4
  • Java Cannot Load Main Class Without Adding .java
  • compareTo with objects returns a false while it is true
  • How to save permutation in a Set Java
  • How to show top to bottom leaks in my path
  • How to count number of edges between red and white nodes in a graph?
  • How to use read file from URI using C# in PowerShell line by line?
  • Ruby Heapsort: `sink': undefined method `&gt;' for nil:NilClass
  • parameterized test constructor of junit java error message: Test class should have exactly one public zero-argument constructor
  • `java myClass` not finding a .class file when `java myClass.java` does? (OpenJDK)
  • About exercise 1.2.9 on p.115 in &quot;Algorithms 4th Edition&quot; by Robert Sedgewick and Kevin Wayne
Trending Discussions on algs4

QUESTION

Java Cannot Load Main Class Without Adding .java

Asked 2021-Oct-24 at 16:08

I'm trying to run a Java class file which I've compiled, but it keeps telling me that it cannot find or load the main class.

I have a directory which looks like this: Directory

My goal is to run the RandomWord.java file, which takes in a file input and relies on the algs4.jar file found in the .lift sub-directory. From what I've seen, to compile, I need to run the following (assuming I'm cd'ed into the hello directory):
$ javac -cp .lift/algs4.jar RandomWord.java
This should create my RandomWord.class file. Now, to run it with a txt file, for example with coin.txt, I believe I should be running the following:
$ java -cp .lift/algs4.jar RandomWord < coin.txt
However, this results in an error stating: Error: Could not find or load main class RandomWord.

I've done a ton of experimenting with this but I have no idea what's going on, but I've found that running the following works:
$ java -cp .lift/algs4.jar RandomWord.java < coin.txt
However, I believe when a .class file is created, I shouldn't be writing .java in my command line, so I'm really confused.

ANSWER

Answered 2021-Oct-24 at 16:08

Windows:

$ java -cp ".lift/algs4.jar;." RandomWord < coin.txt

Linux/Mac

$ java -cp ".lift/algs4.jar:." RandomWord < coin.txt

Current dir must be added to classpath to allow java to find classes there.

Source https://stackoverflow.com/questions/69698482

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install algs4

This repository is intended for use with either the Maven or Gradle build managers. It can be run from either the command line or integrated into Eclipse, NetBeans, and IntelliJ. You can also access it via Bintray.

Support

This wishlist.txt contains a list of algorithms and data structures that we would like to add to the repository. Indeed, several of the algorithms and data structures in this repository were contributed by others. If interested, please follow the same style as the code in the repository and thoroughly test your code before contacting us.

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