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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		Scanner sc = new Scanner(System.in);
  13. 		int n = sc.nextInt();
  14. 		int m = sc.nextInt();
  15. 		List<List<Integer>> adj = new ArrayList<>();
  16. 		for(int i=0; i<=n;i++){
  17. 			adj.add(new ArrayList<>());
  18. 		}
  19.  
  20. 		for(int i=0; i<m; i++){
  21. 			int u = sc.nextInt();
  22. 			int v = sc.nextInt();
  23. 			adj.get(u).add(v);
  24. 			adj.get(v).add(u);
  25. 		}
  26. 		System.out.println(adj);
  27. 	isReachable(adj,6);
  28. 	}
  29.  
  30. 	public static void isReachable(	List<List<Integer>> adj,int src){
  31. 		Queue<Integer> q = new LinkedList<>();
  32. 		boolean visited[] = new boolean[adj.size()];
  33. 		q.add(src);
  34. 		visited[src] = true;
  35.  
  36. 		while(!q.isEmpty()){
  37. 			int cur = q.poll();
  38.  
  39. 			for(int x : adj.get(cur)){
  40. 				if(!visited[x]){
  41. 					q.add(x);
  42. 					visited[x] = true;
  43. 				}
  44. 			}
  45. 		}
  46.  
  47. 		for(int i = 1; i< visited.length; i++){
  48. 			System.out.print(visited[i]+" ");
  49. 		}
  50. 	}
  51.  
  52. }
Success #stdin #stdout 0.16s 58916KB
comments (?)
stdin
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7
5
1 2
1 3
2 5
3 4
6 7
stdout
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[[], [2, 3], [1, 5], [1, 4], [3], [2], [7], [6]]
false false false false false true true
https://ideone.com/ZRmDVO
language:
Java (HotSpot 12)
created:
8 days ago
visibility:
public

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