Create bfstraversal.java

Graphs 1/bfstraversal.java

@@ -0,0 +1,44 @@
+import java.util.Scanner;
+import java.util.Queue;
+import java.util.*;
+
+public class Solution {
+
+    public static void printHelper(int edges[][], int sv,boolean visited[]){
+        Queue<Integer> q = new LinkedList<>();
+        q.add(sv);
+        while(q.size()!=0){
+            int firstelem = q.remove();
+            System.out.print(firstelem+" ");
+            visited[sv] = true;
+            for(int i=0; i<edges[0].length; i++){
+                if(edges[firstelem][i]==1 && !visited[i]){
+                    q.add(i);
+                    visited[i]=true;
+                }       
+            }
+        }   
+    }
+    // we have to deal with both connected and non connected
+    public static void print(int edges[][]){
+        boolean visited[] = new boolean[edges.length];
+        for(int i=0; i< edges.length; i++){
+            if(!visited[i]){
+                printHelper(edges, i, visited);   
+            }
+        }
+    }
+	public static void main(String[] args) {
+		Scanner s = new Scanner(System.in);
+		int V = s.nextInt();
+		int E = s.nextInt();
+        int edges[][] = new int[V][V];
+        for(int i =0; i< E; i++){
+            int fv = s.nextInt();
+            int sv = s.nextInt();
+            edges[fv][sv] = 1;   
+            edges[sv][fv] =1;
+        }
+        print(edges);
+	}
+}