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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. long long n;
  4. string s;
  5. void backtrack(long long pos)
  6. {
  7.     if(pos==n) // đến số n
  8.     {
  9.         cout << s << "\n";
  10.         return;
  11.     }
  12.     for (long long i=0; i<=1; i++)
  13.     {
  14.  
  15.         s[2*pos]=char(i+'0');
  16.         s[2*pos+1]=' ';
  17.         backtrack(pos+1);
  18.     }
  19. }
  20. int main()
  21. {
  22.     ios_base::sync_with_stdio(0);
  23.     cin.tie(0);
  24.     cin >> n;
  25.     for (long long i=1; i<=2*n+1; i++)
  26.     {
  27.         s+=' ';
  28.     }
  29.     backtrack(0);
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/S8ud7h
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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