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  1.  
  2. #include <iostream>
  3. #include <fstream>
  4.  
  5. using namespace std;
  6. fstream f("permutari1.in");
  7. fstream g("permutari1.out");
  8.  
  9. int st[15],n;
  10.  
  11. void afis(int k)
  12. {
  13.     for (int i=k-1; i>=1; i--)
  14.     {
  15.         cout <<st[i]<< "\t"<< "\n";
  16.     }
  17. }
  18.  
  19. bool valid (int k)
  20. {
  21.     int i;
  22.     for (i=1; i<k; i++)
  23.     {
  24.         if (st[k]==st[i])
  25.             return 0;
  26.         return 1;
  27.     }
  28. }
  29.  
  30. void back(int k)
  31. {
  32.     int i; 
  33.     if (k==n+1)
  34.     {
  35.         afis(k); 
  36.     }
  37.     else
  38.     {
  39.         for (i=1; i<=n; i++)
  40.         {
  41.             st[k]=i;
  42.             if (valid(k))
  43.             {
  44.                 back(k+1);
  45.             }
  46.         }
  47.     }
  48. }
  49.  
  50. int main()
  51. {
  52.     f>>n;
  53.     back(1);
  54.     return 0;
  55. }
Success #stdin #stdout 0s 5288KB
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https://ideone.com/2ps41R
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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