25 lines
451 B
Python
25 lines
451 B
Python
s, t = 5, 25
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c = [15]
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n = [12]
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arr = [1] * (s + 1)
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for k in range(len(c) + 1):
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s__ = s + 1 if k == 0 else c[k - 1] + 1
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s_ = s__ - 1
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t__ = c[k] + 1 if k < len(c) else t + 1
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t_ = t__ - 1
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for i in range(s__, t__):
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e = 0
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if i - 1 >= s_ and not i - 1 in n:
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e += arr[i - 1]
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if i - 3 >= s_ and not i - 3 in n:
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e += arr[i - 3]
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arr.append(e)
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back = arr[t_]
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arr = [0] * (t_ + 1)
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arr[t_] = back
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print(arr[t])
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# 280
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