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  1. #include <stdio.h>
  2.  
  3. /*        01234567890123456 */
  4. #define L 1000000000000001
  5. #define M 9999999999999997
  6.  
  7. void f(long long n, int delta) {
  8.   unsigned long long m, q, r;
  9.   for (;; n += delta) {
  10.     m = 1;
  11.     do {
  12.       m += 2;
  13.       q = n / m;
  14.       r = n % m;
  15.     } while (r != 0 && q >= m);
  16.     if (r == 0) {
  17. /*      printf("\n%llu(%llu * %llu...%llu)", n, m, q, r); */
  18.       continue;
  19.     }
  20.     if (q < m) {
  21.       printf("\n%llu\n", n);
  22.       break;
  23.     }
  24.   }
  25. }
  26.  
  27. void step1(void) {  f(L, +2); }
  28. void step2(void) {  f(M, -2); }
  29.  
  30. int main() {
  31.   step1();
  32.   step2();
  33.   return 0;
  34. }
  35. /* end */
  36. /*
  37.  
  38. */
  39.  
Success #stdin #stdout 6.63s 1832KB
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1000000000000037

9999999999999937
https://ideone.com/8YznqH
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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