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  1. using System;
  2.  
  3. public class Test
  4. {
  5.     public static void Main()
  6.     {
  7.         Console.WriteLine(ConvertToRanges("1,2,3,4,8,9,10,15"));
  8.     	Console.WriteLine(ConvertToRanges("5,6,7,9,10,11,12,15,16"));
  9.     }
  10.  
  11.     public static string ConvertToRanges(string pageNos)
  12.     {
  13.     	string result=string.Empty;
  14.     	string[] arr1 = pageNos.Split(',');
  15.     	int[] arr = new int[arr1.Length];
  16.  
  17.     	for (int x = 0; x < arr1.Length; x++) // Convert string array to integer array
  18.     	{
  19.     		arr[x] = Convert.ToInt32(arr1[x].ToString());
  20.     	}
  21.  
  22.     	int start,end;  // track start and end
  23.     	end = start = arr[0];
  24.     	for (int i = 1; i < arr.Length; i++)
  25.     	{
  26.     		// as long as entries are consecutive, move end forward
  27.     		if (arr[i] == (arr[i - 1] + 1))
  28.     		{
  29.     			end = arr[i];
  30.     		}
  31.     		else
  32.     		{
  33.     			// when no longer consecutive, add group to result
  34.     			// depending on whether start=end (single item) or not
  35.     			if (start == end)
  36.     				result += start + ",";
  37.     			else
  38.     				result += start + "-" + end + ",";
  39.  
  40.     			start = end = arr[i];
  41.     		}
  42.     	}
  43.  
  44.     	// handle the final group
  45.     	if (start == end)
  46.     		result += start;
  47.     	else
  48.     		result += start + "-" + end;
  49.  
  50.     	return result;
  51.     }
  52. }
Success #stdin #stdout 0.04s 37016KB
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stdin
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Standard input is empty
stdout
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1-4,8-10,15
5-7,9-12,15-16
https://ideone.com/7HdpS7
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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