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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. 	public static class Node{
  10. 		int level;
  11. 		List<Node> children = new ArrayList<Node>();
  12. 		Node(int level){
  13. 			this.level = level;
  14. 		}
  15.  
  16. 		@Override public String toString(){
  17. 			StringBuilder sb = new StringBuilder();
  18. 			for(int i=1; i<level; i++)
  19. 				sb.append("\t");
  20. 			sb.append("H" + level + "\n");
  21. 			for(Node n : children)
  22. 				sb.append(n.toString());
  23.  
  24. 			return sb.toString();
  25. 		}
  26. 	}
  27.  
  28. 	public static void main (String[] args) throws java.lang.Exception{
  29. 		String[] h = {"H1", "H1", "H2", "H3", "H3", "H2", "H2", "H3",
  30. 		                    "H4", "H2", "H2", "H2", "H1", "H2", "H2", "H3",
  31. 		                    "H4", "H4", "H2"};
  32.  
  33. 		Node[] mostRecent = new Node[5];
  34. 		mostRecent[0] = new Node(0);     // root node
  35.  
  36. 		for(int i = 0; i < h.length; i++){
  37. 			int level = Integer.parseInt("" + h[i].charAt(1));
  38. 			Node n = new Node(level);
  39. 			mostRecent[level - 1].children.add(n);
  40. 			mostRecent[level] = n;
  41. 		} 
  42.  
  43. 		System.out.print(mostRecent[0]);
  44. 	}
  45. }
Success #stdin #stdout 0.07s 380224KB
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stdin
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Standard input is empty
stdout
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H0
H1
H1
	H2
		H3
		H3
	H2
	H2
		H3
			H4
	H2
	H2
	H2
H1
	H2
	H2
		H3
			H4
			H4
	H2
https://ideone.com/BypIe3
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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