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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve() {
  5.     int n;
  6.     cin >> n;
  7.  
  8.     vector<int> a(n);
  9.  
  10.     // Create a palindromic sequence with a repeating pattern
  11.     for (int i = 0; i < n; i++) {
  12.         a[i] = (i % 2) + 1; // Alternating between 1 and 2 ensures many palindromic subsequences
  13.     }
  14.  
  15.     for (int i = 0; i < n; i++) {
  16.         cout << a[i] << " ";
  17.     }
  18.     cout << endl;
  19. }
  20.  
  21. int main() {
  22.     ios_base::sync_with_stdio(false);
  23.     cin.tie(NULL);
  24.  
  25.     int t;
  26.     cin >> t;
  27.     while (t--) {
  28.         solve();
  29.     }
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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3
6
9
15
stdout
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1 2 1 2 1 2 
1 2 1 2 1 2 1 2 1 
1 2 1 2 1 2 1 2 1 2 1 2 1 2 1
https://ideone.com/htebiM
language:
C++ (gcc 8.3)
created:
13 hours ago
visibility:
public

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