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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. 		// your code goes here
  13. 		Scanner sc=new Scanner(System.in);
  14. 		int n=sc.nextInt();
  15. 		List<List<Integer>> adj=new ArrayList<>();
  16. 		for(int i=0;i<=n;i++)
  17. 		adj.add(new ArrayList<>());
  18.  
  19. 		for(int i=1;i<n;i++)
  20. 		{
  21. 			int u=sc.nextInt();
  22. 			int v=sc.nextInt();
  23. 			adj.get(u).add(v);
  24. 			adj.get(v).add(u);
  25. 		}
  26.  
  27. 		for(int i=1;i<=n;i++)
  28. 		{
  29. 			if(adj.get(i).size()<=2)
  30. 			System.out.println(i+" can become the root of the tree");
  31. 		}
  32.  
  33.  
  34. 	}
  35. }
Success #stdin #stdout 0.14s 58972KB
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stdin
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5
1 2
2 3
3 1
5 1
stdout
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2 can become the root of the tree
3 can become the root of the tree
4 can become the root of the tree
5 can become the root of the tree
https://ideone.com/jw3XER
language:
Java (HotSpot 12)
created:
17 days ago
visibility:
public

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