元のコードはこうでしたが、 from itertools import izip, count def next(s, k): return s[:k] + (s[k] - 1,) + tuple(n + 1 for n in s[k+1:]) def E(s): num_papers = sum(s) if num_papers == 0: return 0.0 return (1 if num_papers == 1 else 0) \ + s…