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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.  
  24. 			adj.get(u).add(v);
  25. 			adj.get(v).add(u);
  26. 		}
  27.  
  28. 		shoetestPathOfIthNodeFromSrc(adj,1);
  29.  	}
  30.  
  31.  	public static void shoetestPathOfIthNodeFromSrc(List<List<Integer>> adj, int src){
  32.  		int n = adj.size();
  33.  		boolean	visited[] =  new boolean[n];
  34.  		int level[] = new int [n];
  35.  		int path[] = new int [n];
  36.  		Queue<Integer> q = new LinkedList<>();
  37.  		q.offer(src);
  38.  		level[src] = 0;
  39.  		path[src] = 1;
  40.  		visited[src] = true;
  41.  		while(!q.isEmpty()){
  42.  			int cur = q.poll();
  43.  
  44.  			for(int x : adj.get(cur)){
  45.  
  46.  				if(!visited[x]){
  47.  					q.add(x);
  48.  					level[x] = level[cur]+1;
  49.  					path[x] = path[cur];
  50.  					visited[x]=true;
  51.  				}else{
  52.  					if(level[cur]+1 == level[x]){
  53.  						path[x] = path[x] + path[cur];
  54.  					}
  55.  				}
  56.  			}
  57.  		}
  58.  		System.out.println("level :-->"+Arrays.toString(level));
  59.  		System.out.println("path :-->"+Arrays.toString(path));
  60.  	}
  61.  
  62. }
Success #stdin #stdout 0.14s 58760KB
comments (?)
stdin
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10 11
1 2
1 3
1 4
4 8
3 6
2 5
8 9
6 7
5 10
9 10
7 10
stdout
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level :-->[0, 0, 1, 1, 1, 2, 2, 3, 2, 3, 3]
path :-->[0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
https://ideone.com/VHNVVr
language:
Java (HotSpot 12)
created:
6 days ago
visibility:
public

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