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  1. using System;
  2. using System.Text;
  3.  
  4. public class Test
  5. {
  6. public static void Main()
  7. {
  8. string input = "20150824100112345";
  9.  
  10. string output = input.Substring(0, 4) + "/" // 2015
  11. + input.Substring(4, 2) + "/" // 08
  12. + input.Substring(6, 2) + "/" // 24
  13. + input.Substring(8, 2) + "/" // 10
  14. + input.Substring(10, 2) + "/" // 01
  15. + input.Substring(12, 2) + "/" // 12
  16. + input.Substring(14, 3); // 345
  17.  
  18. var sb = new StringBuilder(23);
  19. sb.Append(input, 0, 4);
  20. sb.Append('/');
  21. sb.Append(input, 4, 2);
  22. sb.Append('/');
  23. sb.Append(input, 6, 2);
  24. sb.Append('/');
  25. sb.Append(input, 8, 2);
  26. sb.Append('/');
  27. sb.Append(input, 10, 2);
  28. sb.Append('/');
  29. sb.Append(input, 12, 2);
  30. sb.Append('/');
  31. sb.Append(input, 14, 3);
  32. string output2 = sb.ToString();
  33.  
  34. Console.WriteLine(output);
  35. Console.WriteLine(output2);
  36. }
  37. }
Success #stdin #stdout 0.04s 23880KB
stdin
Standard input is empty
stdout
2015/08/24/10/01/12/345
2015/08/24/10/01/12/345