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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		var s = "abbccddeeffa";
  10. 		var repeatedChars = s.GroupBy(x => x).Where(y => y.Count() > 1).Select(z=>z.Key);
  11. 		Console.Write(string.Join(", ", repeatedChars));
  12. 	}
  13. }
Success #stdin #stdout 0.02s 131584KB
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stdin
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Standard input is empty
stdout
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a, b, c, d, e, f
https://ideone.com/Z14iyT
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
secret

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