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Albinutte

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Albinutte
Mar 4th, 2016
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  1. def countDown(n):
  2.     if n % 3:
  3.         return "-1"
  4.     res = [str(i) for i in range(n, 0, -1)]
  5.     for i in range(3, n, 3):
  6.         res[i], res[i + 2] = res[i + 2], res[i]
  7.     return ''.join(res)
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