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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4.  
  5. using namespace std;
  6.  
  7. bool canCreateDoubledSequence(int N) {
  8.     // Une séquence doublée est impossible si N > 4
  9.     // car pour N ≥ 5, la distance N ne peut pas être respectée
  10.     return N <= 4;
  11. }
  12.  
  13. vector<int> constructDoubledSequence(int N) {
  14.     if (N == 1) {
  15.         return {1, 1};
  16.     }
  17.     if (N == 4) {
  18.         // Une solution valide pour N = 4
  19.         return {2, 3, 2, 4, 3, 1, 1, 4};
  20.     }
  21.     // Pour N = 2 et N = 3, pas de solution
  22.     return {};
  23. }
  24.  
  25. int main() {
  26.     ios_base::sync_with_stdio(false);
  27.     cin.tie(nullptr);
  28.  
  29.     int T;
  30.     cin >> T;
  31.  
  32.     while (T--) {
  33.         int N;
  34.         cin >> N;
  35.  
  36.         if (!canCreateDoubledSequence(N)) {
  37.             cout << "-1\n";
  38.             continue;
  39.         }
  40.  
  41.         vector<int> sequence = constructDoubledSequence(N);
  42.         if (sequence.empty()) {
  43.             cout << "-1\n";
  44.         } else {
  45.             for (int i = 0; i < sequence.size(); i++) {
  46.                 cout << sequence[i];
  47.                 if (i < sequence.size() - 1) cout << " ";
  48.             }
  49.             cout << "\n";
  50.         }
  51.     }
  52.  
  53.     return 0;
  54. }
Success #stdin #stdout 0.01s 5292KB
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stdin
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4
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stdout
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1 1
-1
-1
2 3 2 4 3 1 1 4
https://ideone.com/a8kQlK
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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