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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.stream.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11.  
  12. public static String formatAsRange(List<Integer> list) {
  13. 	return String.format("(%d-%d)", list.get(0), list.get(list.size()-1));
  14. }
  15.  
  16. public static String consecutiveElements(int[] array, int minGroupLength) {
  17.     StringBuilder sb = new StringBuilder();
  18.     List<Integer> group = new ArrayList<>();
  19.     for(int i = 0; i < array.length; i++) {
  20.         if (i == 0 || array[i] == array[i-1] + 1) {
  21.             group.add(array[i]);
  22.         } else  {
  23.             if (group.size() >= minGroupLength) {
  24.                 sb.append(formatAsRange(group)).append(',');                
  25.             } else {
  26.             	var csv = group.stream().map(String::valueOf).collect(Collectors.joining(","));
  27.                 sb.append(csv).append(',');
  28.             }
  29.             group.clear();
  30.             sb.append(array[i]).append(',');
  31.         }
  32.     }
  33.     return sb.toString();
  34. }
  35.  
  36. 	public static void main (String[] args) throws java.lang.Exception
  37. 	{
  38. 		// your code goes here
  39. 		int[] arr = {-4, -2, -1, 0, 1, 3, 4, 5, 6, 9, 10, 12, 13, 14, 18};
  40. 		System.out.println(consecutiveElements(arr, 3));
  41. 	}
  42. }
Success #stdin #stdout 0.09s 48496KB
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Standard input is empty
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-4,-2,(-1-1),3,(4-6),9,10,12,13,14,18,
https://ideone.com/uiq1Dc
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
secret

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