Merge branch 'master' into BAEL-3442
This commit is contained in:
Krzysiek
+7
-1
@@ -84,4 +84,10 @@ software-security/sql-injection-samples/derby.log
|
||||
spring-soap/src/main/java/com/baeldung/springsoap/gen/
|
||||
/report-*.json
|
||||
transaction.log
|
||||
*-shell.log
|
||||
*-shell.log
|
||||
|
||||
apache-cxf/cxf-aegis/baeldung.xml
|
||||
apache-fop/src/test/resources/input.xml
|
||||
apache-fop/src/test/resources/output_herold.pdf
|
||||
apache-fop/src/test/resources/output_html2fo.pdf
|
||||
apache-fop/src/test/resources/output_jtidy.pdf
|
||||
+41
-42
@@ -1,47 +1,46 @@
|
||||
<?xml version="1.0"?>
|
||||
<project
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
|
||||
xmlns="http://maven.apache.org/POM/4.0.0"
|
||||
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
|
||||
xmlns="http://maven.apache.org/POM/4.0.0"
|
||||
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>akka-http</artifactId>
|
||||
<name>akka-http</name>
|
||||
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>akka-http</artifactId>
|
||||
<name>akka-http</name>
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-modules</artifactId>
|
||||
<version>1.0.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<parent>
|
||||
<artifactId>parent-modules</artifactId>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<version>1.0.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>com.typesafe.akka</groupId>
|
||||
<artifactId>akka-http_2.12</artifactId>
|
||||
<version>${akka.http.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.typesafe.akka</groupId>
|
||||
<artifactId>akka-stream_2.12</artifactId>
|
||||
<version>${akka.stream.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.typesafe.akka</groupId>
|
||||
<artifactId>akka-http-jackson_2.12</artifactId>
|
||||
<version>${akka.http.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.typesafe.akka</groupId>
|
||||
<artifactId>akka-http-testkit_2.12</artifactId>
|
||||
<version>${akka.http.version}</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>com.typesafe.akka</groupId>
|
||||
<artifactId>akka-http_2.12</artifactId>
|
||||
<version>${akka.http.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.typesafe.akka</groupId>
|
||||
<artifactId>akka-stream_2.12</artifactId>
|
||||
<version>${akka.stream.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.typesafe.akka</groupId>
|
||||
<artifactId>akka-http-jackson_2.12</artifactId>
|
||||
<version>${akka.http.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.typesafe.akka</groupId>
|
||||
<artifactId>akka-http-testkit_2.12</artifactId>
|
||||
<version>${akka.http.version}</version>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
<properties>
|
||||
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
|
||||
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
|
||||
<akka.http.version>10.0.11</akka.http.version>
|
||||
<akka.stream.version>2.5.11</akka.stream.version>
|
||||
</properties>
|
||||
|
||||
<properties>
|
||||
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
|
||||
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
|
||||
<akka.http.version>10.0.11</akka.http.version>
|
||||
<akka.stream.version>2.5.11</akka.stream.version>
|
||||
</properties>
|
||||
</project>
|
||||
|
||||
@@ -1,13 +1,13 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>akka-streams</artifactId>
|
||||
<name>akka-streams</name>
|
||||
|
||||
<parent>
|
||||
<artifactId>parent-modules</artifactId>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-modules</artifactId>
|
||||
<version>1.0.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
|
||||
@@ -1,10 +1,11 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>algorithms-genetic</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
<name>algorithms-genetic</name>
|
||||
|
||||
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-modules</artifactId>
|
||||
@@ -60,5 +61,4 @@
|
||||
<commons-codec.version>1.11</commons-codec.version>
|
||||
</properties>
|
||||
|
||||
|
||||
</project>
|
||||
|
||||
@@ -7,8 +7,6 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
|
||||
|
||||
- [Validating Input With Finite Automata in Java](https://www.baeldung.com/java-finite-automata)
|
||||
- [Example of Hill Climbing Algorithm](https://www.baeldung.com/java-hill-climbing-algorithm)
|
||||
- [Monte Carlo Tree Search for Tic-Tac-Toe Game](https://www.baeldung.com/java-monte-carlo-tree-search)
|
||||
- [Binary Search Algorithm in Java](https://www.baeldung.com/java-binary-search)
|
||||
- [Introduction to Minimax Algorithm](https://www.baeldung.com/java-minimax-algorithm)
|
||||
- [How to Calculate Levenshtein Distance in Java?](https://www.baeldung.com/java-levenshtein-distance)
|
||||
- [How to Find the Kth Largest Element in Java](https://www.baeldung.com/java-kth-largest-element)
|
||||
|
||||
@@ -1,10 +1,11 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>algorithms-miscellaneous-1</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
<name>algorithms-miscellaneous-1</name>
|
||||
|
||||
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-modules</artifactId>
|
||||
@@ -43,7 +44,7 @@
|
||||
<groupId>com.github.dpaukov</groupId>
|
||||
<artifactId>combinatoricslib3</artifactId>
|
||||
<version>${combinatoricslib3.version}</version>
|
||||
</dependency>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<build>
|
||||
|
||||
@@ -1,5 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>algorithms-miscellaneous-2</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
@@ -34,9 +35,9 @@
|
||||
<version>${org.jgrapht.core.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.jgrapht</groupId>
|
||||
<artifactId>jgrapht-ext</artifactId>
|
||||
<version>${org.jgrapht.ext.version}</version>
|
||||
<groupId>org.jgrapht</groupId>
|
||||
<artifactId>jgrapht-ext</artifactId>
|
||||
<version>${org.jgrapht.ext.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>pl.allegro.finance</groupId>
|
||||
|
||||
@@ -0,0 +1,30 @@
|
||||
package com.baeldung.algorithms.astar;
|
||||
|
||||
import java.util.Map;
|
||||
import java.util.Set;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
|
||||
public class Graph<T extends GraphNode> {
|
||||
private final Set<T> nodes;
|
||||
|
||||
private final Map<String, Set<String>> connections;
|
||||
|
||||
public Graph(Set<T> nodes, Map<String, Set<String>> connections) {
|
||||
this.nodes = nodes;
|
||||
this.connections = connections;
|
||||
}
|
||||
|
||||
public T getNode(String id) {
|
||||
return nodes.stream()
|
||||
.filter(node -> node.getId().equals(id))
|
||||
.findFirst()
|
||||
.orElseThrow(() -> new IllegalArgumentException("No node found with ID"));
|
||||
}
|
||||
|
||||
public Set<T> getConnections(T node) {
|
||||
return connections.get(node.getId()).stream()
|
||||
.map(this::getNode)
|
||||
.collect(Collectors.toSet());
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,5 @@
|
||||
package com.baeldung.algorithms.astar;
|
||||
|
||||
public interface GraphNode {
|
||||
String getId();
|
||||
}
|
||||
+66
@@ -0,0 +1,66 @@
|
||||
package com.baeldung.algorithms.astar;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.HashMap;
|
||||
import java.util.List;
|
||||
import java.util.Map;
|
||||
import java.util.PriorityQueue;
|
||||
import java.util.Queue;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
public class RouteFinder<T extends GraphNode> {
|
||||
private final Graph<T> graph;
|
||||
private final Scorer<T> nextNodeScorer;
|
||||
private final Scorer<T> targetScorer;
|
||||
|
||||
public RouteFinder(Graph<T> graph, Scorer<T> nextNodeScorer, Scorer<T> targetScorer) {
|
||||
this.graph = graph;
|
||||
this.nextNodeScorer = nextNodeScorer;
|
||||
this.targetScorer = targetScorer;
|
||||
}
|
||||
|
||||
public List<T> findRoute(T from, T to) {
|
||||
Map<T, RouteNode<T>> allNodes = new HashMap<>();
|
||||
Queue<RouteNode> openSet = new PriorityQueue<>();
|
||||
|
||||
RouteNode<T> start = new RouteNode<>(from, null, 0d, targetScorer.computeCost(from, to));
|
||||
allNodes.put(from, start);
|
||||
openSet.add(start);
|
||||
|
||||
while (!openSet.isEmpty()) {
|
||||
System.out.println("Open Set contains: " + openSet.stream().map(RouteNode::getCurrent).collect(Collectors.toSet()));
|
||||
RouteNode<T> next = openSet.poll();
|
||||
System.out.println("Looking at node: " + next);
|
||||
if (next.getCurrent().equals(to)) {
|
||||
System.out.println("Found our destination!");
|
||||
|
||||
List<T> route = new ArrayList<>();
|
||||
RouteNode<T> current = next;
|
||||
do {
|
||||
route.add(0, current.getCurrent());
|
||||
current = allNodes.get(current.getPrevious());
|
||||
} while (current != null);
|
||||
|
||||
System.out.println("Route: " + route);
|
||||
return route;
|
||||
}
|
||||
|
||||
graph.getConnections(next.getCurrent()).forEach(connection -> {
|
||||
double newScore = next.getRouteScore() + nextNodeScorer.computeCost(next.getCurrent(), connection);
|
||||
RouteNode<T> nextNode = allNodes.getOrDefault(connection, new RouteNode<>(connection));
|
||||
allNodes.put(connection, nextNode);
|
||||
|
||||
if (nextNode.getRouteScore() > newScore) {
|
||||
nextNode.setPrevious(next.getCurrent());
|
||||
nextNode.setRouteScore(newScore);
|
||||
nextNode.setEstimatedScore(newScore + targetScorer.computeCost(connection, to));
|
||||
openSet.add(nextNode);
|
||||
System.out.println("Found a better route to node: " + nextNode);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
throw new IllegalStateException("No route found");
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,67 @@
|
||||
package com.baeldung.algorithms.astar;
|
||||
|
||||
import java.util.StringJoiner;
|
||||
|
||||
class RouteNode<T extends GraphNode> implements Comparable<RouteNode> {
|
||||
private final T current;
|
||||
private T previous;
|
||||
private double routeScore;
|
||||
private double estimatedScore;
|
||||
|
||||
RouteNode(T current) {
|
||||
this(current, null, Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY);
|
||||
}
|
||||
|
||||
RouteNode(T current, T previous, double routeScore, double estimatedScore) {
|
||||
this.current = current;
|
||||
this.previous = previous;
|
||||
this.routeScore = routeScore;
|
||||
this.estimatedScore = estimatedScore;
|
||||
}
|
||||
|
||||
T getCurrent() {
|
||||
return current;
|
||||
}
|
||||
|
||||
T getPrevious() {
|
||||
return previous;
|
||||
}
|
||||
|
||||
double getRouteScore() {
|
||||
return routeScore;
|
||||
}
|
||||
|
||||
double getEstimatedScore() {
|
||||
return estimatedScore;
|
||||
}
|
||||
|
||||
void setPrevious(T previous) {
|
||||
this.previous = previous;
|
||||
}
|
||||
|
||||
void setRouteScore(double routeScore) {
|
||||
this.routeScore = routeScore;
|
||||
}
|
||||
|
||||
void setEstimatedScore(double estimatedScore) {
|
||||
this.estimatedScore = estimatedScore;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int compareTo(RouteNode other) {
|
||||
if (this.estimatedScore > other.estimatedScore) {
|
||||
return 1;
|
||||
} else if (this.estimatedScore < other.estimatedScore) {
|
||||
return -1;
|
||||
} else {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return new StringJoiner(", ", RouteNode.class.getSimpleName() + "[", "]").add("current=" + current)
|
||||
.add("previous=" + previous).add("routeScore=" + routeScore).add("estimatedScore=" + estimatedScore)
|
||||
.toString();
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,5 @@
|
||||
package com.baeldung.algorithms.astar;
|
||||
|
||||
public interface Scorer<T extends GraphNode> {
|
||||
double computeCost(T from, T to);
|
||||
}
|
||||
+19
@@ -0,0 +1,19 @@
|
||||
package com.baeldung.algorithms.astar.underground;
|
||||
|
||||
import com.baeldung.algorithms.astar.Scorer;
|
||||
|
||||
public class HaversineScorer implements Scorer<Station> {
|
||||
@Override
|
||||
public double computeCost(Station from, Station to) {
|
||||
double R = 6372.8; // In kilometers
|
||||
|
||||
double dLat = Math.toRadians(to.getLatitude() - from.getLatitude());
|
||||
double dLon = Math.toRadians(to.getLongitude() - from.getLongitude());
|
||||
double lat1 = Math.toRadians(from.getLatitude());
|
||||
double lat2 = Math.toRadians(to.getLatitude());
|
||||
|
||||
double a = Math.pow(Math.sin(dLat / 2),2) + Math.pow(Math.sin(dLon / 2),2) * Math.cos(lat1) * Math.cos(lat2);
|
||||
double c = 2 * Math.asin(Math.sqrt(a));
|
||||
return R * c;
|
||||
}
|
||||
}
|
||||
+643
File diff suppressed because it is too large
Load Diff
+42
@@ -0,0 +1,42 @@
|
||||
package com.baeldung.algorithms.astar.underground;
|
||||
|
||||
import java.util.StringJoiner;
|
||||
|
||||
import com.baeldung.algorithms.astar.GraphNode;
|
||||
|
||||
public class Station implements GraphNode {
|
||||
private final String id;
|
||||
private final String name;
|
||||
private final double latitude;
|
||||
private final double longitude;
|
||||
|
||||
public Station(String id, String name, double latitude, double longitude) {
|
||||
this.id = id;
|
||||
this.name = name;
|
||||
this.latitude = latitude;
|
||||
this.longitude = longitude;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public double getLatitude() {
|
||||
return latitude;
|
||||
}
|
||||
|
||||
public double getLongitude() {
|
||||
return longitude;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return new StringJoiner(", ", Station.class.getSimpleName() + "[", "]").add("id='" + id + "'")
|
||||
.add("name='" + name + "'").add("latitude=" + latitude).add("longitude=" + longitude).toString();
|
||||
}
|
||||
}
|
||||
Binary file not shown.
|
Before Width: | Height: | Size: 9.4 KiB After Width: | Height: | Size: 10 KiB |
@@ -14,6 +14,6 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
|
||||
- [A Guide to the Folding Technique in Java](https://www.baeldung.com/folding-hashing-technique)
|
||||
- [Creating a Triangle with for Loops in Java](https://www.baeldung.com/java-print-triangle)
|
||||
- [Efficient Word Frequency Calculator in Java](https://www.baeldung.com/java-word-frequency)
|
||||
- [Interpolation Search in Java](https://www.baeldung.com/java-interpolation-search)
|
||||
- [The K-Means Clustering Algorithm in Java](https://www.baeldung.com/java-k-means-clustering-algorithm)
|
||||
- [Creating a Custom Annotation in Java](https://www.baeldung.com/java-custom-annotation)
|
||||
- More articles: [[<-- prev]](/algorithms-miscellaneous-2) [[next -->]](/algorithms-miscellaneous-4)
|
||||
|
||||
@@ -1,3 +1,4 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
@@ -91,4 +92,5 @@
|
||||
<jmh-core.version>1.19</jmh-core.version>
|
||||
<jmh-generator.version>1.19</jmh-generator.version>
|
||||
</properties>
|
||||
|
||||
</project>
|
||||
@@ -1,15 +1,14 @@
|
||||
## Algorithms - Miscellaneous
|
||||
|
||||
This module contains articles about algorithms. Some classes of algorithms, e.g., [sorting](/../algorithms-sorting) and
|
||||
[genetic algorithms](/../algorithms-genetic), have their own dedicated modules.
|
||||
This module contains articles about algorithms. Some classes of algorithms, e.g., [sorting](https://github.com/eugenp/tutorials/blob/algorithms-sorting) and [genetic algorithms](https://github.com/eugenp/tutorials/blob/algorithms-genetic), have their own dedicated modules.
|
||||
|
||||
### Relevant articles:
|
||||
|
||||
- [Multi-Swarm Optimization Algorithm in Java](https://www.baeldung.com/java-multi-swarm-algorithm)
|
||||
- [String Search Algorithms for Large Texts](https://www.baeldung.com/java-full-text-search-algorithms)
|
||||
- [Check If a String Contains All The Letters of The Alphabet](https://www.baeldung.com/java-string-contains-all-letters)
|
||||
- [Find the Middle Element of a Linked List](https://www.baeldung.com/java-linked-list-middle-element)
|
||||
- [Find Substrings That Are Palindromes in Java](https://www.baeldung.com/java-palindrome-substrings)
|
||||
- [Find the Longest Substring without Repeating Characters](https://www.baeldung.com/java-longest-substring-without-repeated-characters)
|
||||
- [Permutations of an Array in Java](https://www.baeldung.com/java-array-permutations)
|
||||
- More articles: [[<-- prev]](/../algorithms-miscellaneous-3) [[next -->]](/../algorithms-miscellaneous-5)
|
||||
- [Find the Smallest Missing Integer in an Array](https://www.baeldung.com/java-smallest-missing-integer-in-array)
|
||||
- More articles: [[<-- prev]](/algorithms-miscellaneous-3) [[next -->]](/algorithms-miscellaneous-5)
|
||||
|
||||
@@ -1,10 +1,11 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>algorithms-miscellaneous-4</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
<name>algorithms-miscellaneous-4</name>
|
||||
|
||||
|
||||
<parent>
|
||||
<groupId>com.baeldung</groupId>
|
||||
<artifactId>parent-modules</artifactId>
|
||||
|
||||
+37
@@ -0,0 +1,37 @@
|
||||
package com.baeldung.algorithms.smallestinteger;
|
||||
|
||||
import java.util.Arrays;
|
||||
|
||||
public class SmallestMissingPositiveInteger {
|
||||
public static int searchInSortedArray(int[] input) {
|
||||
for (int i = 0; i < input.length; i++) {
|
||||
if (i != input[i]) {
|
||||
return i;
|
||||
}
|
||||
}
|
||||
|
||||
return input.length;
|
||||
}
|
||||
|
||||
public static int searchInUnsortedArraySortingFirst(int[] input) {
|
||||
Arrays.sort(input);
|
||||
return searchInSortedArray(input);
|
||||
}
|
||||
|
||||
public static int searchInUnsortedArrayBooleanArray(int[] input) {
|
||||
boolean[] flags = new boolean[input.length];
|
||||
for (int number : input) {
|
||||
if (number < flags.length) {
|
||||
flags[number] = true;
|
||||
}
|
||||
}
|
||||
|
||||
for (int i = 0; i < flags.length; i++) {
|
||||
if (!flags[i]) {
|
||||
return i;
|
||||
}
|
||||
}
|
||||
|
||||
return flags.length;
|
||||
}
|
||||
}
|
||||
-194
@@ -1,194 +0,0 @@
|
||||
package com.baeldung.algorithms.string.search;
|
||||
|
||||
import java.math.BigInteger;
|
||||
import java.util.Random;
|
||||
|
||||
public class StringSearchAlgorithms {
|
||||
public static long getBiggerPrime(int m) {
|
||||
BigInteger prime = BigInteger.probablePrime(getNumberOfBits(m) + 1, new Random());
|
||||
return prime.longValue();
|
||||
}
|
||||
|
||||
public static long getLowerPrime(long number) {
|
||||
BigInteger prime = BigInteger.probablePrime(getNumberOfBits(number) - 1, new Random());
|
||||
return prime.longValue();
|
||||
}
|
||||
|
||||
private static int getNumberOfBits(final int number) {
|
||||
return Integer.SIZE - Integer.numberOfLeadingZeros(number);
|
||||
}
|
||||
|
||||
private static int getNumberOfBits(final long number) {
|
||||
return Long.SIZE - Long.numberOfLeadingZeros(number);
|
||||
}
|
||||
|
||||
public static int simpleTextSearch(char[] pattern, char[] text) {
|
||||
int patternSize = pattern.length;
|
||||
int textSize = text.length;
|
||||
|
||||
int i = 0;
|
||||
|
||||
while ((i + patternSize) <= textSize) {
|
||||
int j = 0;
|
||||
while (text[i + j] == pattern[j]) {
|
||||
j += 1;
|
||||
if (j >= patternSize)
|
||||
return i;
|
||||
}
|
||||
i += 1;
|
||||
}
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
public static int RabinKarpMethod(char[] pattern, char[] text) {
|
||||
int patternSize = pattern.length; // m
|
||||
int textSize = text.length; // n
|
||||
|
||||
long prime = getBiggerPrime(patternSize);
|
||||
|
||||
long r = 1;
|
||||
for (int i = 0; i < patternSize - 1; i++) {
|
||||
r *= 2;
|
||||
r = r % prime;
|
||||
}
|
||||
|
||||
long[] t = new long[textSize];
|
||||
t[0] = 0;
|
||||
|
||||
long pfinger = 0;
|
||||
|
||||
for (int j = 0; j < patternSize; j++) {
|
||||
t[0] = (2 * t[0] + text[j]) % prime;
|
||||
pfinger = (2 * pfinger + pattern[j]) % prime;
|
||||
}
|
||||
|
||||
int i = 0;
|
||||
boolean passed = false;
|
||||
|
||||
int diff = textSize - patternSize;
|
||||
for (i = 0; i <= diff; i++) {
|
||||
if (t[i] == pfinger) {
|
||||
passed = true;
|
||||
for (int k = 0; k < patternSize; k++) {
|
||||
if (text[i + k] != pattern[k]) {
|
||||
passed = false;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (passed) {
|
||||
return i;
|
||||
}
|
||||
}
|
||||
|
||||
if (i < diff) {
|
||||
long value = 2 * (t[i] - r * text[i]) + text[i + patternSize];
|
||||
t[i + 1] = ((value % prime) + prime) % prime;
|
||||
}
|
||||
}
|
||||
return -1;
|
||||
|
||||
}
|
||||
|
||||
public static int KnuthMorrisPrattSearch(char[] pattern, char[] text) {
|
||||
int patternSize = pattern.length; // m
|
||||
int textSize = text.length; // n
|
||||
|
||||
int i = 0, j = 0;
|
||||
|
||||
int[] shift = KnuthMorrisPrattShift(pattern);
|
||||
|
||||
while ((i + patternSize) <= textSize) {
|
||||
while (text[i + j] == pattern[j]) {
|
||||
j += 1;
|
||||
if (j >= patternSize)
|
||||
return i;
|
||||
}
|
||||
|
||||
if (j > 0) {
|
||||
i += shift[j - 1];
|
||||
j = Math.max(j - shift[j - 1], 0);
|
||||
} else {
|
||||
i++;
|
||||
j = 0;
|
||||
}
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
public static int[] KnuthMorrisPrattShift(char[] pattern) {
|
||||
int patternSize = pattern.length;
|
||||
|
||||
int[] shift = new int[patternSize];
|
||||
shift[0] = 1;
|
||||
|
||||
int i = 1, j = 0;
|
||||
|
||||
while ((i + j) < patternSize) {
|
||||
if (pattern[i + j] == pattern[j]) {
|
||||
shift[i + j] = i;
|
||||
j++;
|
||||
} else {
|
||||
if (j == 0)
|
||||
shift[i] = i + 1;
|
||||
|
||||
if (j > 0) {
|
||||
i = i + shift[j - 1];
|
||||
j = Math.max(j - shift[j - 1], 0);
|
||||
} else {
|
||||
i = i + 1;
|
||||
j = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
return shift;
|
||||
}
|
||||
|
||||
public static int BoyerMooreHorspoolSimpleSearch(char[] pattern, char[] text) {
|
||||
int patternSize = pattern.length;
|
||||
int textSize = text.length;
|
||||
|
||||
int i = 0, j = 0;
|
||||
|
||||
while ((i + patternSize) <= textSize) {
|
||||
j = patternSize - 1;
|
||||
while (text[i + j] == pattern[j]) {
|
||||
j--;
|
||||
if (j < 0)
|
||||
return i;
|
||||
}
|
||||
i++;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
public static int BoyerMooreHorspoolSearch(char[] pattern, char[] text) {
|
||||
|
||||
int shift[] = new int[256];
|
||||
|
||||
for (int k = 0; k < 256; k++) {
|
||||
shift[k] = pattern.length;
|
||||
}
|
||||
|
||||
for (int k = 0; k < pattern.length - 1; k++) {
|
||||
shift[pattern[k]] = pattern.length - 1 - k;
|
||||
}
|
||||
|
||||
int i = 0, j = 0;
|
||||
|
||||
while ((i + pattern.length) <= text.length) {
|
||||
j = pattern.length - 1;
|
||||
|
||||
while (text[i + j] == pattern[j]) {
|
||||
j -= 1;
|
||||
if (j < 0)
|
||||
return i;
|
||||
}
|
||||
|
||||
i = i + shift[text[i + pattern.length - 1]];
|
||||
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
-25
@@ -1,25 +0,0 @@
|
||||
package com.baeldung.algorithms;
|
||||
|
||||
|
||||
import org.junit.Assert;
|
||||
import org.junit.Test;
|
||||
|
||||
import com.baeldung.algorithms.string.search.StringSearchAlgorithms;
|
||||
|
||||
public class StringSearchAlgorithmsUnitTest {
|
||||
|
||||
|
||||
@Test
|
||||
public void testStringSearchAlgorithms(){
|
||||
String text = "This is some nice text.";
|
||||
String pattern = "some";
|
||||
|
||||
int realPosition = text.indexOf(pattern);
|
||||
Assert.assertTrue(realPosition == StringSearchAlgorithms.simpleTextSearch(pattern.toCharArray(), text.toCharArray()));
|
||||
Assert.assertTrue(realPosition == StringSearchAlgorithms.RabinKarpMethod(pattern.toCharArray(), text.toCharArray()));
|
||||
Assert.assertTrue(realPosition == StringSearchAlgorithms.KnuthMorrisPrattSearch(pattern.toCharArray(), text.toCharArray()));
|
||||
Assert.assertTrue(realPosition == StringSearchAlgorithms.BoyerMooreHorspoolSimpleSearch(pattern.toCharArray(), text.toCharArray()));
|
||||
Assert.assertTrue(realPosition == StringSearchAlgorithms.BoyerMooreHorspoolSearch(pattern.toCharArray(), text.toCharArray()));
|
||||
}
|
||||
|
||||
}
|
||||
+97
@@ -0,0 +1,97 @@
|
||||
package com.baeldung.algorithms.smallestinteger;
|
||||
|
||||
import org.junit.jupiter.api.Test;
|
||||
|
||||
import static org.assertj.core.api.Assertions.assertThat;
|
||||
|
||||
class SmallestMissingPositiveIntegerUnitTest {
|
||||
@Test
|
||||
void givenArrayWithThreeMissing_whenSearchInSortedArray_thenThree() {
|
||||
int[] input = new int[] {0, 1, 2, 4, 5};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInSortedArray(input);
|
||||
|
||||
assertThat(result).isEqualTo(3);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithOneAndThreeMissing_whenSearchInSortedArray_thenOne() {
|
||||
int[] input = new int[] {0, 2, 4, 5};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInSortedArray(input);
|
||||
|
||||
assertThat(result).isEqualTo(1);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithoutMissingInteger_whenSearchInSortedArray_thenArrayLength() {
|
||||
int[] input = new int[] {0, 1, 2, 3, 4, 5};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInSortedArray(input);
|
||||
|
||||
assertThat(result).isEqualTo(input.length);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithThreeMissing_whenSearchInUnsortedArraySortingFirst_thenThree() {
|
||||
int[] input = new int[] {1, 4, 0, 5, 2};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInUnsortedArraySortingFirst(input);
|
||||
|
||||
assertThat(result).isEqualTo(3);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithOneAndThreeMissing_whenSearchInUnsortedArraySortingFirst_thenOne() {
|
||||
int[] input = new int[] {4, 2, 0, 5};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInUnsortedArraySortingFirst(input);
|
||||
|
||||
assertThat(result).isEqualTo(1);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithoutMissingInteger_whenSearchInUnsortedArraySortingFirst_thenArrayLength() {
|
||||
int[] input = new int[] {4, 5, 1, 3, 0, 2};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInUnsortedArraySortingFirst(input);
|
||||
|
||||
assertThat(result).isEqualTo(input.length);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithThreeMissing_whenSearchInUnsortedArrayBooleanArray_thenThree() {
|
||||
int[] input = new int[] {1, 4, 0, 5, 2};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInUnsortedArrayBooleanArray(input);
|
||||
|
||||
assertThat(result).isEqualTo(3);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithOneAndThreeMissing_whenSearchInUnsortedArrayBooleanArray_thenOne() {
|
||||
int[] input = new int[] {4, 2, 0, 5};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInUnsortedArrayBooleanArray(input);
|
||||
|
||||
assertThat(result).isEqualTo(1);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithoutMissingInteger_whenSearchInUnsortedArrayBooleanArray_thenArrayLength() {
|
||||
int[] input = new int[] {4, 5, 1, 3, 0, 2};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInUnsortedArrayBooleanArray(input);
|
||||
|
||||
assertThat(result).isEqualTo(input.length);
|
||||
}
|
||||
|
||||
@Test
|
||||
void givenArrayWithoutZero_whenSearchInUnsortedArrayBooleanArray_thenZero() {
|
||||
int[] input = new int[] {11, 13, 14, 15};
|
||||
|
||||
int result = SmallestMissingPositiveInteger.searchInUnsortedArrayBooleanArray(input);
|
||||
|
||||
assertThat(result).isEqualTo(0);
|
||||
}
|
||||
}
|
||||
@@ -8,4 +8,6 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
|
||||
- [Converting Between Byte Arrays and Hexadecimal Strings in Java](https://www.baeldung.com/java-byte-arrays-hex-strings)
|
||||
- [Reversing a Binary Tree in Java](https://www.baeldung.com/java-reversing-a-binary-tree)
|
||||
- [Find If Two Numbers Are Relatively Prime in Java](https://www.baeldung.com/java-two-relatively-prime-numbers)
|
||||
- [Knapsack Problem Implementation in Java](https://www.baeldung.com/java-knapsack)
|
||||
- [How to Determine if a Binary Tree is Balanced](https://www.baeldung.com/java-balanced-binary-tree)
|
||||
- More articles: [[<-- prev]](/../algorithms-miscellaneous-4)
|
||||
|
||||
@@ -1,5 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>algorithms-miscellaneous-5</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
@@ -17,6 +18,11 @@
|
||||
<artifactId>commons-codec</artifactId>
|
||||
<version>${commons-codec.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.apache.commons</groupId>
|
||||
<artifactId>commons-math3</artifactId>
|
||||
<version>${commons-math3.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.projectlombok</groupId>
|
||||
<artifactId>lombok</artifactId>
|
||||
@@ -28,6 +34,7 @@
|
||||
<artifactId>tradukisto</artifactId>
|
||||
<version>${tradukisto.version}</version>
|
||||
</dependency>
|
||||
|
||||
<dependency>
|
||||
<groupId>org.assertj</groupId>
|
||||
<artifactId>assertj-core</artifactId>
|
||||
@@ -52,6 +59,7 @@
|
||||
<tradukisto.version>1.0.1</tradukisto.version>
|
||||
<org.assertj.core.version>3.9.0</org.assertj.core.version>
|
||||
<commons-codec.version>1.11</commons-codec.version>
|
||||
<commons-math3.version>3.6.1</commons-math3.version>
|
||||
</properties>
|
||||
|
||||
</project>
|
||||
+33
@@ -0,0 +1,33 @@
|
||||
package com.baeldung.algorithms.balancedbinarytree;
|
||||
|
||||
public class BalancedBinaryTree {
|
||||
|
||||
public static boolean isBalanced(Tree tree) {
|
||||
return isBalancedRecursive(tree, -1).isBalanced;
|
||||
}
|
||||
|
||||
private static Result isBalancedRecursive(Tree tree, int depth) {
|
||||
if (tree == null) {
|
||||
return new Result(true, -1);
|
||||
}
|
||||
|
||||
Result leftSubtreeResult = isBalancedRecursive(tree.left(), depth + 1);
|
||||
Result rightSubtreeResult = isBalancedRecursive(tree.right(), depth + 1);
|
||||
|
||||
boolean isBalanced = Math.abs(leftSubtreeResult.height - rightSubtreeResult.height) <= 1;
|
||||
boolean subtreesAreBalanced = leftSubtreeResult.isBalanced && rightSubtreeResult.isBalanced;
|
||||
int height = Math.max(leftSubtreeResult.height, rightSubtreeResult.height) + 1;
|
||||
|
||||
return new Result(isBalanced && subtreesAreBalanced, height);
|
||||
}
|
||||
|
||||
private static final class Result {
|
||||
private final boolean isBalanced;
|
||||
private final int height;
|
||||
|
||||
private Result(boolean isBalanced, int height) {
|
||||
this.isBalanced = isBalanced;
|
||||
this.height = height;
|
||||
}
|
||||
}
|
||||
}
|
||||
+34
@@ -0,0 +1,34 @@
|
||||
package com.baeldung.algorithms.balancedbinarytree;
|
||||
|
||||
public class Tree {
|
||||
private final int value;
|
||||
private final Tree left;
|
||||
private final Tree right;
|
||||
|
||||
public Tree(int value, Tree left, Tree right) {
|
||||
this.value = value;
|
||||
this.left = left;
|
||||
this.right = right;
|
||||
}
|
||||
|
||||
public int value() {
|
||||
return value;
|
||||
}
|
||||
|
||||
public Tree left() {
|
||||
return left;
|
||||
}
|
||||
|
||||
public Tree right() {
|
||||
return right;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return String.format("[%s, %s, %s]",
|
||||
value,
|
||||
left == null ? "null" : left.toString(),
|
||||
right == null ? "null" : right.toString()
|
||||
);
|
||||
}
|
||||
}
|
||||
+17
@@ -0,0 +1,17 @@
|
||||
package com.baeldung.algorithms.binarygap;
|
||||
|
||||
public class BinaryGap {
|
||||
static int calculateBinaryGap(int n) {
|
||||
return calculateBinaryGap(n >>> Integer.numberOfTrailingZeros(n), 0, 0);
|
||||
}
|
||||
|
||||
static int calculateBinaryGap(int n, int current, int maximum) {
|
||||
if (n == 0) {
|
||||
return maximum;
|
||||
} else if ((n & 1) == 0) {
|
||||
return calculateBinaryGap(n >>> 1, current + 1, maximum);
|
||||
} else {
|
||||
return calculateBinaryGap(n >>> 1, 0, Math.max(maximum, current));
|
||||
}
|
||||
}
|
||||
}
|
||||
+83
@@ -0,0 +1,83 @@
|
||||
package com.baeldung.algorithms.caesarcipher;
|
||||
|
||||
import org.apache.commons.math3.stat.inference.ChiSquareTest;
|
||||
|
||||
import java.util.Arrays;
|
||||
import java.util.stream.IntStream;
|
||||
|
||||
public class CaesarCipher {
|
||||
private static final char LETTER_A = 'a';
|
||||
private static final char LETTER_Z = 'z';
|
||||
private static final int ALPHABET_SIZE = LETTER_Z - LETTER_A + 1;
|
||||
private static final double[] ENGLISH_LETTERS_PROBABILITIES = {0.073, 0.009, 0.030, 0.044, 0.130, 0.028, 0.016, 0.035, 0.074, 0.002, 0.003, 0.035, 0.025, 0.078, 0.074, 0.027, 0.003, 0.077, 0.063, 0.093, 0.027, 0.013, 0.016, 0.005, 0.019, 0.001};
|
||||
|
||||
public String cipher(String message, int offset) {
|
||||
StringBuilder result = new StringBuilder();
|
||||
|
||||
for (char character : message.toCharArray()) {
|
||||
if (character != ' ') {
|
||||
int originalAlphabetPosition = character - LETTER_A;
|
||||
int newAlphabetPosition = (originalAlphabetPosition + offset) % ALPHABET_SIZE;
|
||||
char newCharacter = (char) (LETTER_A + newAlphabetPosition);
|
||||
result.append(newCharacter);
|
||||
} else {
|
||||
result.append(character);
|
||||
}
|
||||
}
|
||||
|
||||
return result.toString();
|
||||
}
|
||||
|
||||
public String decipher(String message, int offset) {
|
||||
return cipher(message, ALPHABET_SIZE - (offset % ALPHABET_SIZE));
|
||||
}
|
||||
|
||||
public int breakCipher(String message) {
|
||||
return probableOffset(chiSquares(message));
|
||||
}
|
||||
|
||||
private double[] chiSquares(String message) {
|
||||
double[] expectedLettersFrequencies = expectedLettersFrequencies(message.length());
|
||||
|
||||
double[] chiSquares = new double[ALPHABET_SIZE];
|
||||
|
||||
for (int offset = 0; offset < chiSquares.length; offset++) {
|
||||
String decipheredMessage = decipher(message, offset);
|
||||
long[] lettersFrequencies = observedLettersFrequencies(decipheredMessage);
|
||||
double chiSquare = new ChiSquareTest().chiSquare(expectedLettersFrequencies, lettersFrequencies);
|
||||
chiSquares[offset] = chiSquare;
|
||||
}
|
||||
|
||||
return chiSquares;
|
||||
}
|
||||
|
||||
private long[] observedLettersFrequencies(String message) {
|
||||
return IntStream.rangeClosed(LETTER_A, LETTER_Z)
|
||||
.mapToLong(letter -> countLetter((char) letter, message))
|
||||
.toArray();
|
||||
}
|
||||
|
||||
private long countLetter(char letter, String message) {
|
||||
return message.chars()
|
||||
.filter(character -> character == letter)
|
||||
.count();
|
||||
}
|
||||
|
||||
private double[] expectedLettersFrequencies(int messageLength) {
|
||||
return Arrays.stream(ENGLISH_LETTERS_PROBABILITIES)
|
||||
.map(probability -> probability * messageLength)
|
||||
.toArray();
|
||||
}
|
||||
|
||||
private int probableOffset(double[] chiSquares) {
|
||||
int probableOffset = 0;
|
||||
for (int offset = 0; offset < chiSquares.length; offset++) {
|
||||
System.out.println(String.format("Chi-Square for offset %d: %.2f", offset, chiSquares[offset]));
|
||||
if (chiSquares[offset] < chiSquares[probableOffset]) {
|
||||
probableOffset = offset;
|
||||
}
|
||||
}
|
||||
|
||||
return probableOffset;
|
||||
}
|
||||
}
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user