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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. void abcombirec(char prefix[], int k) {
  5.     char ab[] = {'a', 'b'};
  6.     if (k == 0) {
  7.         printf("%s\n", prefix);
  8.         return;
  9.     }
  10.     for (int i = 0; i < 2; i++) {
  11.     	size_t len = strlen(prefix);
  12.     	char tmp[len+2];
  13.     	strcpy(tmp, prefix);
  14.     	tmp[len] = ab[i];
  15.     	tmp[len+1] = '\0';
  16.         abcombirec(tmp, k - 1);
  17.     }
  18. }
  19.  
  20. void abcombi(int k) {
  21.     char str[] = "";
  22.     abcombirec(str, k);
  23. }
  24.  
  25. int main() {
  26.     (abcombi(3));
  27.     return 0;
  28. }
Success #stdin #stdout 0s 4268KB
comments (?)
stdin 
Standard input is empty
stdout 
aaa
aab
aba
abb
baa
bab
bba
bbb
https://ideone.com/nJrQML
language:
C99 (gcc 8.3)
created:
4 years ago
visibility:
public

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