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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int n, ski = 0;//ski dung de tinh so hang,n la de ....................................................................................................................................................................................................................................................................lam so cuoi
  5. vector<int> a; //in ra chuoi banana
  6. bool beo[12];
  7. vector<vector<int>> res;
  8.  
  9. void backTracking() {
  10.     if (a.size() == n) {
  11.         res.push_back(a);
  12.         return;
  13.     }
  14.  
  15.     for (int i = 1; i <= n; i++) {
  16.         if (beo[i] == false && (a.size() == 0 || a.size() > 0 && (i + a.back()) % 3 != 0)) {
  17.             beo[i] = true;
  18.             a.push_back(i);
  19.             backTracking();
  20.             a.pop_back();
  21.             beo[i] = false;
  22.         }
  23.     }
  24. }
  25.  
  26. int main() {
  27.     cin >> n;
  28.  
  29.     backTracking();
  30.     cout << res.size() << '\n';
  31.     for (auto perm : res) {
  32.         for (auto i : perm) {
  33.             cout << i << " ";
  34.         }
  35.         cout << '\n';
  36.     }
  37. }
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/P9zlOn
language:
C++ (gcc 8.3)
created:
1 hour ago
visibility:
public

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