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  1. #include <stdio.h>
  2.  
  3. int printSequenceTo(unsigned n)
  4. {
  5.     if (n == 1) { printf("1"); return 1; }
  6.     int depth;
  7.     if (n & 1) {
  8.         int factor = 3;
  9.         do {
  10.             if (n % factor == 0) {
  11.                 depth = printSequenceTo(n / factor * (factor-1));
  12.                 factor = 0;
  13.                 break;
  14.             }
  15.             factor += 2;
  16.         } while (factor * factor <= n);
  17.         if (factor) depth = printSequenceTo(n-1);
  18.     }
  19.     else
  20.         depth = printSequenceTo(n/2);
  21.     printf(",%u", n);
  22.     return depth + 1;
  23. }
  24.  
  25. int main(void)
  26. {
  27.     printf(" [%d elements]\n", printSequenceTo(310));
  28.     printf(" [%d elements]\n", printSequenceTo(42));
  29.     printf(" [%d elements]\n", printSequenceTo(15));
  30.     printf(" [%d elements]\n", printSequenceTo(1535));
  31.     printf(" [%d elements]\n", printSequenceTo(2047));
  32.     printf(" [%d elements]\n", printSequenceTo(3071));
  33. }
Success #stdin #stdout 0s 2828KB
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stdin
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Standard input is empty
stdout
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1,2,4,5,10,15,30,31,62,124,155,310 [12 elements]
1,2,3,6,7,14,21,42 [8 elements]
1,2,4,5,10,15 [6 elements]
1,2,4,8,16,17,34,51,102,153,306,307,614,1228,1535 [15 elements]
1,2,4,5,10,11,22,44,88,89,178,356,445,890,979,1958,2047 [17 elements]
1,2,4,5,10,20,40,41,82,83,166,249,498,747,1494,2988,3071 [17 elements]
https://ideone.com/8lXxc
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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