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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3.  
  4. int main(void)
  5. {
  6. const char alphabet[] = "0123456789abcdefghijklmnopqrstuvwxyz";
  7. const size_t last_digit = sizeof(alphabet) - 2; // '\0'
  8. const size_t length;
  9. if (scanf("%zu", &length) != 1) exit(EXIT_FAILURE);
  10. size_t number[length]; // indices into alphabet
  11. for (size_t i = 0; i < length; ++i) number[i] = 0;
  12. for ( ; ; ) {
  13. // print number
  14. for (size_t i = 0; i < length; ++i) putchar(alphabet[number[i]]);
  15. putchar('\n');
  16.  
  17. // increment the rightmost digit
  18. size_t pos = length;
  19. while (number[--pos] == last_digit) { // overflow
  20. if (pos == 0)
  21. return 0; // no more digits
  22. number[pos] = 0; // set to zero and increment the left neighbour
  23. }
  24. ++number[pos];
  25. }
  26. }
  27.  
Success #stdin #stdout 0s 4320KB
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