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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. import javax.script.ScriptEngineManager;
  6. import javax.script.ScriptEngine;
  7.  
  8. class Ideone
  9. {
  10. 	// single : x -> [x]
  11. 	public static String expandSingle (String input)
  12. 	{
  13. 		String out = "";
  14. 		for (String str : input.split(" "))
  15. 		{
  16. 			out += " ";
  17. 			if(str.matches("[0-9]+"))
  18. 			{
  19. 				out += "["+str+"]";
  20. 			}
  21. 			else
  22. 			{
  23. 				out += str;
  24. 			}
  25. 		}
  26. 		return out.substring(1);
  27. 	}
  28.  
  29. 	// range : {start,end,step} -> [x,..,y]
  30. 	public static String expandRange (String input)
  31. 	{
  32. 		String out = "";
  33. 		int a,b,c;
  34. 		int i=0;
  35. 		for (String str : input.split(" "))
  36. 		{
  37. 			out += " ";
  38. 			if(str.matches("\\{[0-9]+,[0-9]+,[0-9]+\\}"))
  39. 			{
  40. 				str = str.replaceAll("[\\{\\}]","");
  41. 				a = Integer.parseInt(str.split(",")[0]);
  42. 				b = Integer.parseInt(str.split(",")[1]);
  43. 				c = Integer.parseInt(str.split(",")[2]);
  44.  
  45. 				out += "["+a;
  46. 				while ((a+=c) <= b) out += ","+a;
  47. 				out += "]";
  48. 			}
  49. 			else
  50. 			{
  51. 				out += str;
  52. 			}
  53. 		}
  54. 		return out.substring(1);
  55. 	}
  56.  
  57. 	public static void main (String[] args) throws java.lang.Exception
  58. 	{
  59. 		String input = "3 * [3,2] / {0,2,1}";
  60. 		System.out.println(" input = "+input);
  61. 		input = expandSingle(input);
  62. 		input = expandRange(input);
  63. 		System.out.println(" expand = "+input);
  64. 		evaluate(input);
  65. 	}
  66.  
  67. 	public static void evaluate (String input) throws java.lang.Exception
  68. 	{
  69. 		int i = 0, j = 0;
  70. 		String t = "";
  71. 		ArrayList<String[]> set = new ArrayList<String[]>();
  72. 		ArrayList<String> in = new ArrayList<String>();
  73. 		ArrayList<String> out = new ArrayList<String>();
  74.  
  75. 		// map sets
  76. 		for (String str : input.split(" "))
  77. 		{
  78. 			if(str.matches("\\[[0-9,]+\\]"))
  79. 			{
  80. 				set.add(str.replaceAll("[\\[\\]]","").split(","));
  81. 				t+=" $"+i++;
  82. 			}
  83. 			else t+=" "+str;
  84. 		}
  85. 		in.add(t.substring(1));
  86.  
  87. 		// generate expressions
  88. 		while (j<i)
  89. 		{
  90. 			out.clear();
  91. 			for (String exp : in)
  92. 			{
  93. 				for (String sub : set.get(j))
  94. 				{
  95. 					out.add(exp.replace("$"+j,sub));
  96. 				}
  97. 			}
  98. 			in.clear();
  99. 			in.addAll(out);
  100. 			j++;
  101. 		}
  102.  
  103. 		ScriptEngineManager mgr = new ScriptEngineManager();
  104.     	ScriptEngine engine = mgr.getEngineByName("JavaScript");
  105.  
  106. 		// print expressions
  107. 		for (String exp : in)
  108. 		{
  109. 			System.out.println(" "+exp+" = "+engine.eval(exp).toString().replace("Infinity","NaN"));
  110. 		}
  111. 	}
  112. }
  113.  
Success #stdin #stdout 1.43s 326528KB
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stdout
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 input = 3 * [3,2] / {0,2,1}
 expand = [3] * [3,2] / [0,1,2]
 3 * 3 / 0 = NaN
 3 * 3 / 1 = 9
 3 * 3 / 2 = 4.5
 3 * 2 / 0 = NaN
 3 * 2 / 1 = 6
 3 * 2 / 2 = 3
https://ideone.com/aL45yp
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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