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  1. #include <stdio.h>
  2.  
  3.  
  4. void print(const int *v, const int size)
  5. {
  6.   if (v != 0) {
  7.     for (int i = 0; i < size; i++) {
  8.   	  printf("%c", i ? ',':'{');
  9.       printf("%d", v[i] );
  10.     }
  11.     printf("}\n");
  12.   }
  13. } // print
  14.  
  15.  
  16. void permute(int *v, const int start, const int n)
  17. {  
  18.   if (start == n-1) {
  19.     print(v, n);
  20.   }
  21.   else {
  22.     for (int i = start; i < n; i++) {
  23.       int tmp = v[i];
  24.  
  25.       v[i] = v[start];
  26.       v[start] = tmp;
  27.       permute(v, start+1, n);
  28.       v[start] = v[i];
  29.       v[i] = tmp;
  30.     }
  31.   }
  32. }
  33.  
  34.  
  35. int main(void)
  36. {
  37.   int v[] = {1, 2, 3};
  38.   permute(v, 0, sizeof(v)/sizeof(int));
  39. }
  40.  
Success #stdin #stdout 0s 2292KB
comments (?)
stdin
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Standard input is empty
stdout
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{1,2,3}
{1,3,2}
{2,1,3}
{2,3,1}
{3,2,1}
{3,1,2}
https://ideone.com/33yUm7
language:
C99 (gcc 8.3)
created:
10 years ago
visibility:
public

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