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May 24th, 2016
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  1. using System;
  2.  
  3. public class MagicDates
  4. {
  5. public static void Main()
  6. {
  7. int startYear = int.Parse(Console.ReadLine());
  8. int endYear = int.Parse(Console.ReadLine());
  9. int magicWeight = int.Parse(Console.ReadLine());
  10.  
  11. DateTime startDate = new DateTime(startYear, 1, 1);
  12. DateTime endDate = new DateTime(endYear, 12, 31);
  13. int count = 0;
  14. for (DateTime d = startDate; d <= endDate; d = d.AddDays(1))
  15. {
  16. int d1 = d.Day / 10;
  17. int d2 = d.Day % 10;
  18. int d3 = d.Month / 10;
  19. int d4 = d.Month % 10;
  20. int d5 = (d.Year / 1000) % 10;
  21. int d6 = (d.Year / 100) % 10;
  22. int d7 = (d.Year / 10) % 10;
  23. int d8 = (d.Year / 1) % 10;
  24. int[] digits = { d1, d2, d3, d4, d5, d6, d7, d8 };
  25. int weight = 0;
  26. for (int first = 0; first < digits.Length; first++)
  27. {
  28. for (int second = first+1; second < digits.Length; second++)
  29. {
  30. weight = weight + (digits[first] * digits[second]);
  31. }
  32. }
  33. //Console.WriteLine("{0:d2}-{1:d2}-{2:d2} weight={3}", d.Day, d.Month, d.Year, weight);
  34. if (weight == magicWeight)
  35. {
  36. Console.WriteLine("{0:d2}-{1:d2}-{2:d2}", d.Day, d.Month, d.Year);
  37. count++;
  38. }
  39. }
  40.  
  41. if (count == 0)
  42. {
  43. Console.WriteLine("No");
  44. }
  45. }
  46. }
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