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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int n, d = 1;
  5. char a[10];
  6.  
  7. void pr() {
  8.     cout<< d<< ": ";
  9.     for (int i = 0; i < n; i++)
  10.         cout << a[i] << " ";
  11.     cout << endl;
  12.     d++;
  13. }
  14.  
  15. void permutation(int i) {
  16.     for (char c : {'A', 'B'}) {
  17.         if (i == 0 || a[i - 1] != 'B' || c != 'B') { // Kiểm tra không có 2 chữ B cạnh nhau
  18.             a[i] = c;
  19.             if (i == n - 1)
  20.                 pr();
  21.             else
  22.                 permutation(i + 1);
  23.         }
  24.     }
  25. }
  26.  
  27. int main() {
  28.     cin >> n;
  29.     permutation(0);
  30. }
  31.  
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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4
stdout
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1: A A A A 
2: A A A B 
3: A A B A 
4: A B A A 
5: A B A B 
6: B A A A 
7: B A A B 
8: B A B A
https://ideone.com/Do1frL
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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