Skip to content
codingtube

codingtube

Coding and Programming tutorials

  • javascript
  • React
  • ES6
  • React js
  • coding
  • ffmpeg
  • java
  • programming
  • information
  • coding
  • Privacy Policy
  • Twitter trends
  • Age Calculatore
  • Codingtube Community
  • YouTube Tags Generator
  • About
  • Toggle search form

Knights Tour Algorthim java

Posted on November 28, 2021 By christo No Comments on Knights Tour Algorthim java

Complete programme of Knights Tour Algorthim java



import java.util.*;

/*
    * Problem Statement: -
    
    Given a N*N board with the Knight placed on the first block of an empty board. Moving according to the rules of
    chess knight must visit each square exactly once. Print the order of each cell in which they are visited.

    Example: -

    Input : N = 8

    Output:
        0  59  38  33  30  17   8  63
        37  34  31  60   9  62  29  16
        58   1  36  39  32  27  18   7
        35  48  41  26  61  10  15  28
        42  57   2  49  40  23   6  19
        47  50  45  54  25  20  11  14
        56  43  52   3  22  13  24   5
        51  46  55  44  53   4  21  12

 */
public class KnightsTour {

    private final static int base = 12;
    private final static int[][] moves = {{1, -2}, {2, -1}, {2, 1}, {1, 2}, {-1, 2}, {-2, 1}, {-2, -1}, {-1, -2}}; // Possible moves by knight on chess
    private static int[][] grid;    // chess grid
    private static int total;   // total squares in chess

    public static void main(String[] args) {
        grid = new int[base][base];
        total = (base - 4) * (base - 4);

        for (int r = 0; r < base; r++) {
            for (int c = 0; c < base; c++) {
                if (r < 2 || r > base - 3 || c < 2 || c > base - 3) {
                    grid[r][c] = -1;
                }
            }
        }

        int row = 2 + (int) (Math.random() * (base - 4));
        int col = 2 + (int) (Math.random() * (base - 4));

        grid[row][col] = 1;

        if (solve(row, col, 2)) {
            printResult();
        } else {
            System.out.println("no result");
        }

    }

    // Return True when solvable
    private static boolean solve(int row, int column, int count) {
        if (count > total) {
            return true;
        }

        List<int[]> neighbor = neighbors(row, column);

        if (neighbor.isEmpty() && count != total) {
            return false;
        }

        Collections.sort(neighbor, new Comparator<int[]>() {
            public int compare(int[] a, int[] b) {
                return a[2] - b[2];
            }
        });

        for (int[] nb : neighbor) {
            row = nb[0];
            column = nb[1];
            grid[row][column] = count;
            if (!orphanDetected(count, row, column) && solve(row, column, count + 1)) {
                return true;
            }
            grid[row][column] = 0;
        }

        return false;
    }

    // Returns List of neighbours
    private static List<int[]> neighbors(int row, int column) {
        List<int[]> neighbour = new ArrayList<>();

        for (int[] m : moves) {
            int x = m[0];
            int y = m[1];
            if (grid[row + y][column + x] == 0) {
                int num = countNeighbors(row + y, column + x);
                neighbour.add(new int[]{row + y, column + x, num});
            }
        }
        return neighbour;
    }

    // Returns the total count of neighbors
    private static int countNeighbors(int row, int column) {
        int num = 0;
        for (int[] m : moves) {
            if (grid[row + m[1]][column + m[0]] == 0) {
                num++;
            }
        }
        return num;
    }

    // Returns true if it is orphan
    private static boolean orphanDetected(int count, int row, int column) {
        if (count < total - 1) {
            List<int[]> neighbor = neighbors(row, column);
            for (int[] nb : neighbor) {
                if (countNeighbors(nb[0], nb[1]) == 0) {
                    return true;
                }
            }
        }
        return false;
    }

    // Prints the result grid
    private static void printResult() {
        for (int[] row : grid) {
            for (int i : row) {
                if (i == -1) {
                    continue;
                }
                System.out.printf("%2d ", i);
            }
            System.out.println();
        }
    }
}

Algorithm, java Tags:algorithm, java, Knights Tour Algorthim

Post navigation

Previous Post: AVL tree programme in java
Next Post: NQueens in java

Related Posts

LeetCode Two Sum III – Data structure design using java data structure
Gnome Sort in java java
Get button name from ActionListener in java ? java
The LinkedHashSet Class in java java
Access Modifiers in Java java
Depth First Search in java Algorithm

Leave a Reply Cancel reply

You must be logged in to post a comment.

Recent Posts

  • Affiliate Marketing Principles
  • The Basics You Need to Know About Affiliate Marketing
  • Affiliate Marketing Options
  • All About Affiliate Marketing
  • Classification of Database Management Systems
  • Three-Tier and n-Tier Architectures
    for Web Applications
  • Two-Tier Client/Server Architectures for DBMSs
  • Basic Client/Server Architectures in DBMS
  • Centralized DBMSs Architecture in DBMS
  • Tools, Application Environments, and Communications Facilities in DBMS

Categories

  • Affiliate marketing (5)
  • Algorithm (43)
  • amp (3)
  • android (223)
  • Android App (8)
  • Android app review (4)
  • android tutorial (60)
  • Artificial intelligence (61)
  • AWS (3)
  • bitcoin (8)
  • blockchain (1)
  • c (5)
  • c language (105)
  • cloud computing (4)
  • coding (4)
  • coding app (4)
  • complex number (1)
  • Computer Graphics (66)
  • data compression (65)
  • data structure (188)
  • DBMS (44)
  • digital marketing (9)
  • distributed systems (11)
  • ffmpeg (26)
  • game (3)
  • html (6)
  • image processing (35)
  • Inequalities (1)
  • information (4)
  • java (212)
  • java network (1)
  • javascript (9)
  • kotlin (4)
  • leetcode (1)
  • math (21)
  • maven (1)
  • mysql (1)
  • Node.js (8)
  • operating system (109)
  • php (310)
  • Principle Of Mathematical Induction (1)
  • programming (6)
  • Python (4)
  • Python data structure (9)
  • React native (1)
  • React.js (22)
  • Redux (1)
  • seo (4)
  • set (12)
  • trigonometry (6)
  • vue.js (35)
  • XML (3)

sitemap

sitemap of videos

sitemap of webstories

sitemap of website

  • Affiliate marketing
  • Algorithm
  • amp
  • android
  • Android App
  • Android app review
  • android tutorial
  • Artificial intelligence
  • AWS
  • bitcoin
  • blockchain
  • c
  • c language
  • cloud computing
  • coding
  • coding app
  • complex number
  • Computer Graphics
  • data compression
  • data structure
  • DBMS
  • digital marketing
  • distributed systems
  • ffmpeg
  • game
  • html
  • image processing
  • Inequalities
  • information
  • java
  • java network
  • javascript
  • kotlin
  • leetcode
  • math
  • maven
  • mysql
  • Node.js
  • operating system
  • php
  • Principle Of Mathematical Induction
  • programming
  • Python
  • Python data structure
  • React native
  • React.js
  • Redux
  • seo
  • set
  • trigonometry
  • vue.js
  • XML
  • Blog
  • Data compression tutorial - codingpoint
  • How to change mbstring in php 5.6
  • How to diagnose out of memory killed PHP-FPM
  • Introduction to jQuery
  • Privacy
  • Affiliate marketing
  • Algorithm
  • amp
  • android
  • Android App
  • Android app review
  • android tutorial
  • Artificial intelligence
  • AWS
  • bitcoin
  • blockchain
  • c
  • c language
  • cloud computing
  • coding
  • coding app
  • complex number
  • Computer Graphics
  • data compression
  • data structure
  • DBMS
  • digital marketing
  • distributed systems
  • ffmpeg
  • game
  • html
  • image processing
  • Inequalities
  • information
  • java
  • java network
  • javascript
  • kotlin
  • leetcode
  • math
  • maven
  • mysql
  • Node.js
  • operating system
  • php
  • Principle Of Mathematical Induction
  • programming
  • Python
  • Python data structure
  • React native
  • React.js
  • Redux
  • seo
  • set
  • trigonometry
  • vue.js
  • XML
  • Blog
  • Data compression tutorial - codingpoint
  • How to change mbstring in php 5.6
  • How to diagnose out of memory killed PHP-FPM
  • Introduction to jQuery
  • Privacy

© codingtube.tech