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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. //double C(String x,Map<Character,Integer>f){double H=0,g;for(char c:x.toCharArray())f.put(c,f.containsKey(c)?f.get(c)+1:1);for(char c:f.keySet()){g=f.get(c);H+=g*Math.log(g/x.length())/Math.log(2);}return-H;}
  6.  
  7. class Ideone
  8. {
  9. 	public static double C(String x,Map<Character,Integer>f)
  10. 	{
  11. 		double H=0,g;
  12.  
  13. 		for(char c:x.toCharArray())
  14. 		{
  15. 			f.put(c, f.containsKey(c) ? f.get(c)+1 : 1);
  16. 		}
  17.  
  18. 		for(char c : f.keySet())
  19. 		{
  20. 			g = f.get(c);
  21. 			H += (g/Math.log(2)) * Math.log(g/x.length());
  22. 		}
  23.  
  24. 		return-H;
  25. 	}
  26.  
  27. 	public static void main (String[] args) throws java.lang.Exception
  28. 	{
  29. 		System.out.println("'This is a test.'=> "+C("This is a test.",new TreeMap<Character,Integer>()));
  30. 		System.out.println("'00001111' => "+C("00001111",new TreeMap<Character,Integer>()));
  31. 		System.out.println("'cwmfjordbankglyphsvextquiz' => "+C("cwmfjordbankglyphsvextquiz",new TreeMap<Character,Integer>()));
  32. 		System.out.println("'               ' => "+C("               ",new TreeMap<Character,Integer>()));
  33. 	}
  34. }
  35.  
  36.  
  37.  
Success #stdin #stdout 0.1s 320512KB
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stdin
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Standard input is empty
stdout
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'This is a test.'=> 45.09358392980084
'00001111' => 8.0
'cwmfjordbankglyphsvextquiz' => 122.21143267166846
'               ' => -0.0
https://ideone.com/QyQzLK
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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