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  1. def doubled_sequence(n):
  2.     if n % 2 != 0:
  3.         return -1
  4.     else:
  5.         sequence = []
  6.         for i in range(1, n // 2 + 1):
  7.             sequence.append(i)
  8.             sequence.append(n - i + 1)
  9.         return ' '.join(map(str, sequence))
  10.  
  11. t = int(input())
  12.  
  13. for _ in range(t):
  14.     n = int(input())
  15.     print(doubled_sequence(n))
Success #stdin #stdout 0.02s 9752KB
comments (?)
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4
1
2
3
4
stdout
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-1
1 2
-1
1 4 2 3
https://ideone.com/UAg6IP
language:
Python 3 (python  3.9.5)
created:
5 days ago
visibility:
public

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