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PastorPastor
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Merge pull request #707 from Florist01/main
pr30-32
2 parents f20d1c5 + 38d14e2 commit 4ec468e

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‎students/23K1167/23K1167-p30.part2/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<artifactId>23K1167</artifactId>
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<groupId>ru.mirea.practice</groupId>
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<version>2024.1</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>23K1167-p30.part2</artifactId>
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<description>Пр </description>
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</project>

‎students/23K1167/23K1167-p30.part2/src/main/java/ru/mirea/practice/task1/task1/BinaryTree.java

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package ru.mirea.practice.task1.task1;
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public class BinaryTree {
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static class Node {
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int value;
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Node left;
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Node right;
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public Node(int value) {
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this.value = value;
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left = right = null;
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}
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}
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Node root;
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public BinaryTree() {
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root = null;
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}
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public void insert(int value) {
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root = insertRec(root, value);
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}
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private Node insertRec(Node root, int value) {
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if (root == null) {
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root = new Node(value);
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return root;
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}
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if (value < root.value) {
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root.left = insertRec(root.left, value);
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} else if (value > root.value) {
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root.right = insertRec(root.right, value);
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}
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return root;
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}
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public void inorder() {
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inorderRec(root);
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}
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private void inorderRec(Node root) {
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if (root != null) {
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inorderRec(root.left);
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System.out.print(root.value + " ");
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inorderRec(root.right);
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}
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}
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public void delete(int value) {
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root = deleteRec(root, value);
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}
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private Node deleteRec(Node root, int value) {
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if (root == null) {
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return root;
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}
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if (value < root.value) {
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root.left = deleteRec(root.left, value);
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} else if (value > root.value) {
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root.right = deleteRec(root.right, value);
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} else {
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if (root.left == null) {
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return root.right;
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} else if (root.right == null) {
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return root.left;
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}
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root.value = minValue(root.right);
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root.right = deleteRec(root.right, root.value);
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}
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return root;
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}
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private int minValue(Node root) {
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int minValue = root.value;
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while (root.left != null) {
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minValue = root.left.value;
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root = root.left;
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}
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return minValue;
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}
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public void deleteTree() {
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root = null;
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}
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public static void main(String[] args) {
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BinaryTree tree = new BinaryTree();
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int[] values = {50, 30, 20, 40, 70, 60, 80, 10, 25, 65};
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for (int value : values) {
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tree.insert(value);
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}
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System.out.println("Дерево до удаления узла:");
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tree.inorder();
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System.out.println();
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tree.delete(20);
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System.out.println("Дерево после удаления узла 20:");
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tree.inorder();
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System.out.println();
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tree.deleteTree();
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System.out.println("Дерево удалено.");
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}
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}

‎students/23K1167/23K1167-p30/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<artifactId>23K1167</artifactId>
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<groupId>ru.mirea.practice</groupId>
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<version>2024.1</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>23K1167-p30</artifactId>
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<description>Пр </description>
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</project>

‎students/23K1167/23K1167-p30/src/main/java/ru/mirea/practice/task1/task1/BinaryTree.java

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package ru.mirea.practice.task1.task1;
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public final class BinaryTree {
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static class Node {
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int data;
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Node left;
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Node right;
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public Node(int data) {
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this.data = data;
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left = right = null;
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}
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}
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private Node root;
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public BinaryTree() {
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root = null;
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}
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public void insert(int data) {
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root = insertRec(root, data);
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}
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private Node insertRec(Node root, int data) {
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if (root == null) {
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root = new Node(data);
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return root;
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}
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if (data < root.data) {
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root.left = insertRec(root.left, data);
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} else if (data > root.data) {
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root.right = insertRec(root.right, data);
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}
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return root;
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}
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public boolean search(int data) {
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return searchRec(root, data);
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}
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private boolean searchRec(Node root, int data) {
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if (root == null) {
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return false;
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}
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if (data == root.data) {
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return true;
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}
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if (data < root.data) {
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return searchRec(root.left, data);
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} else {
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return searchRec(root.right, data);
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}
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}
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public void delete(int data) {
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root = deleteRec(root, data);
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}
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private Node deleteRec(Node root, int data) {
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if (root == null) {
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return root;
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}
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if (data < root.data) {
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root.left = deleteRec(root.left, data);
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} else if (data > root.data) {
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root.right = deleteRec(root.right, data);
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} else {
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if (root.left == null) {
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return root.right;
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} else if (root.right == null) {
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return root.left;
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}
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root.data = minValue(root.right);
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root.right = deleteRec(root.right, root.data);
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}
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return root;
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}
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private int minValue(Node root) {
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int minValue = root.data;
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while (root.left != null) {
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root = root.left;
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minValue = root.data;
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}
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return minValue;
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}
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public void inorder() {
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inorderRec(root);
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}
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private void inorderRec(Node root) {
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if (root != null) {
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inorderRec(root.left);
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System.out.print(root.data + " ");
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inorderRec(root.right);
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}
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}
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public static void main(String[] args) {
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BinaryTree tree = new BinaryTree();
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tree.insert(50);
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tree.insert(30);
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tree.insert(20);
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tree.insert(40);
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tree.insert(70);
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tree.insert(60);
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tree.insert(80);
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System.out.println("Обход дерева в порядке возрастания:");
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tree.inorder();
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System.out.println("\nПоиск элемента 40: " + tree.search(40));
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System.out.println("Поиск элемента 90: " + tree.search(90));
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tree.delete(20);
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System.out.println("\nОбход дерева после удаления 20:");
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tree.inorder();
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}
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}

‎students/23K1167/23K1167-p30/src/main/java/ru/mirea/practice/task1/task2/HuffmanCoding.java

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package ru.mirea.practice.task1.task2;
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import java.util.PriorityQueue;
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import java.util.HashMap;
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import java.util.Map;
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public final class HuffmanCoding {
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private HuffmanCoding() {
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throw new UnsupportedOperationException("Это утилитный класс, и его нельзя создавать.");
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}
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public static void buildHuffmanTree(String text) {
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Map<Character, Integer> frequencyMap = new HashMap<>();
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for (char ch : text.toCharArray()) {
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frequencyMap.put(ch, frequencyMap.getOrDefault(ch, 0) + 1);
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}
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PriorityQueue<HuffmanNode> priorityQueue = new PriorityQueue<>(
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(a, b) -> a.frequency - b.frequency
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);
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for (Map.Entry<Character, Integer> entry : frequencyMap.entrySet()) {
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priorityQueue.offer(new HuffmanNode(entry.getKey(), entry.getValue()));
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}
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while (priorityQueue.size() > 1) {
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HuffmanNode left = priorityQueue.poll();
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HuffmanNode right = priorityQueue.poll();
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HuffmanNode newNode = new HuffmanNode('\0', left.frequency + right.frequency);
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newNode.left = left;
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newNode.right = right;
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priorityQueue.offer(newNode);
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}
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HuffmanNode root = priorityQueue.poll();
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Map<Character, String> huffmanCodeMap = new HashMap<>();
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generateHuffmanCodes(root, "", huffmanCodeMap);
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System.out.println("Хаффмановские коды:");
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for (Map.Entry<Character, String> entry : huffmanCodeMap.entrySet()) {
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System.out.println(entry.getKey() + ": " + entry.getValue());
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}
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StringBuilder compressedText = new StringBuilder();
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for (char ch : text.toCharArray()) {
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compressedText.append(huffmanCodeMap.get(ch));
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}
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System.out.println("Сжатый текст: " + compressedText.toString());
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}
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private static void generateHuffmanCodes(HuffmanNode root, String code, Map<Character, String> huffmanCodeMap) {
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if (root == null) {
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return;
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}
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if (root.left == null && root.right == null) {
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huffmanCodeMap.put(root.ch, code);
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}
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generateHuffmanCodes(root.left, code + "0", huffmanCodeMap);
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generateHuffmanCodes(root.right, code + "1", huffmanCodeMap);
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}
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public static void main(String[] args) {
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String text = "Это пример для кодирования Хаффмана";
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buildHuffmanTree(text);
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}
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}

‎students/23K1167/23K1167-p30/src/main/java/ru/mirea/practice/task1/task2/HuffmanNode.java

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package ru.mirea.practice.task1.task2;
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public class HuffmanNode {
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char ch;
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int frequency;
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HuffmanNode left;
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HuffmanNode right;
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public HuffmanNode(char ch, int frequency) {
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this.ch = ch;
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this.frequency = frequency;
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this.left = this.right = null;
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}
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}
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‎students/23K1167/23K1167-p31/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<artifactId>23K1167</artifactId>
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<groupId>ru.mirea.practice</groupId>
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<version>2024.1</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>23K1167-p31</artifactId>
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<description>Пр </description>
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</project>

‎students/23K1167/23K1167-p31/src/main/java/ru/mirea/practice/task1/task1/Node.java

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package ru.mirea.practice.task1.task1;
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public class Node {
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int value;
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Node left;
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Node middle;
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Node right;
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public Node(int value) {
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this.value = value;
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this.left = null;
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this.middle = null;
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this.right = null;
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}
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}
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