Skip to main content

BREADTH FIRST SEARCH IN JAVA

BREADTH FIRST SEARCH IN JAVA:-


package com.problems.graph;

import java.awt.DisplayMode;
import java.util.Iterator;
import java.util.LinkedList;




public class BFSGraph {

 int maxsize;
 Vertex vertexlist[];
 int matrixlist[][];
 int vertexcount;
 @SuppressWarnings({ "rawtypes", "unused" })
 LinkedList queue;
 
 public BFSGraph()
 {
  maxsize=20;
  matrixlist=new int[maxsize][maxsize];
  vertexlist=new Vertex[maxsize];
  for(int i=0;i<maxsize;i++)
  {
   for(int j=0;j<maxsize;j++)
   {
    matrixlist[i][j]=0;
   }
  }
  queue= new LinkedList();
  
 }
 
 public void addVertex(char label)
 {
  vertexlist[vertexcount++]=new Vertex(label);
 }
 public void addEdge(int i,int j)
 {
  matrixlist[i][j]=1;
  matrixlist[j][i]=1;
 }
 
 public void displayVertex(int v)
 {
  System.out.println(vertexlist[v].label);
 }
 
 public int adjVertex(int v)
 {
  for(int i=0;i<maxsize;i++)
  {
   if(matrixlist[v][i]==1 && vertexlist[i].visited==false )
    return i;
  }
  return -1;
 }
 
 public void bfs()
 {
  System.out.println("in bfs");
  vertexlist[0].visited=true;
  displayVertex(0);
  queue.add(0);
  int v2;
  while(!queue.isEmpty())
  {
   int v1=(Integer) queue.remove();
   System.out.println("removed"+v1);
   while( (v2=adjVertex(v1))!=-1)
   {
   vertexlist[v2].visited=true;
   displayVertex(v2);
   queue.add(v2);
   }
  }
  for(int j=0;j<vertexcount;j++)
  {
   vertexlist[j].visited=false;
  }
 }
}

Comments

.

Popular posts from this blog

Selection Sort in JAVA

What is selection sort? It is a sorting technique that is based on the partitioning of array into two parts, sorted and unsorted. The process is:- 1) Find minimum element in unsorted array. 2) Swap the element at the end of sorted array. when i=0 we don't have any sorted array so element will be replaced from first element later the sorted array end will growas the index. Steps:- underline elements are sorted array, the length is increasing with each minimum element added at the end. minimum element11 11 25 12 22 64 minimum element12 11 12 25 22 64 minimum element22 11 12 22 25 64 minimum element25 11 12 22 25 64 minimum element64 11 12 22 25 64 Program:- package sorting ; public class SelectionSort { //function to print array public static void print ( int [] arr ) { for ( int i = 0 ; i <= arr . length - 1 ; i ++) System . out . print ( " " + arr [ i ]); System . out . printl

Best LeetCode Lists for Interviews

Here is a list of some of the best questions asked in interviews:-  Must do 75 https://leetcode.com/list/5hkn6wze/ Must do 60  https://leetcode.com/list/5eie1aqd/ Must do medium:-  https://leetcode.com/list/5xaelz7g/ Must do Easy:-   https://leetcode.com/list/5r7rxpr1/ Graph:-  https://leetcode.com/list/x18ervrd/  Dynamic Programming:-    https://leetcode.com/list/x14z0dxr/  FaceBook interviews:- https://leetcode.com/list/xyu98pv6/  Amazon Interviews:-  https://leetcode.com/list/5hkniyf7/  Google Interviews:- https://leetcode.com/list/xyu9xfo1/ https://github.com/nazarmubeen/TopProblems/blob/master/README.md