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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. using namespace std;
  5.  
  6. long julianDate(int y, int m, int d)
  7. {
  8.     if (m <= 2) {
  9.         y--;
  10.         m += 12;
  11.     };
  12.     long A = y/100;
  13.     A = 2 - A + A/4;
  14.     long J = (1461L * y)/ 4;
  15.     long K = (306001L*(m + 1))/10000L;
  16.     return J + K + d + 1720995L + A;
  17. };
  18.  
  19. void grigorianDate(long JD,
  20.                    int& y,  int& m, int&  d)
  21. {
  22.     long A = (JD*4 - 7468865L)/146097L;
  23.     A = JD + 1 + A - (A/4L);
  24.     long B = A + 1524;
  25.     long C = (B*20L - 2442L)/7305L;
  26.     long D = (C * 1461L) / 4L;
  27.     long E = (10000L * (B-D)) / 306001L;
  28.     d = B - D - E*306001L/10000L;
  29.     m = ( E <= 13 ) ? E - 1 : E - 13;
  30.     y = ( m > 2 ) ? C - 4716 : C - 4715;
  31. };
  32.  
  33. int weekday(long jd) { return (jd+1)%7; }
  34.  
  35. int main()
  36. {
  37.     int cnt[7] {0};
  38.     for(int y = 1900; y < 2300; ++y)
  39.         for(int m = 1; m <= 12; ++m)
  40.             cnt[weekday(julianDate(y,m,13))]++;
  41.  
  42.     cout << "13:\n";
  43.     cout << "sunday:    " << cnt[0] << " times\n";
  44.     cout << "monday:    " << cnt[1] << " times\n";
  45.     cout << "tuesday:   " << cnt[2] << " times\n";
  46.     cout << "wednesday: " << cnt[3] << " times\n";
  47.     cout << "thursday:  " << cnt[4] << " times\n";
  48.     cout << "friday:    " << cnt[5] << " times\n";
  49.     cout << "saturday:  " << cnt[6] << " times\n";
  50.  
  51. }
  52.  
Success #stdin #stdout 0.01s 5448KB
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stdin
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Standard input is empty
stdout
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13:
sunday:    687 times
monday:    685 times
tuesday:   685 times
wednesday: 687 times
thursday:  684 times
friday:    688 times
saturday:  684 times
https://ideone.com/yPDYeb
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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