Complete day 10
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#!/usr/bin/python3
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adapters = []
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with open("input") as fh:
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for ln in fh:
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adapters.append(int(ln))
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adapters = sorted(adapters)
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last = 0;
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steps = [0, 0, 0, 0]
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for a in adapters:
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assert 1 <= a - last <= 3 # otherwise there is no solution
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steps[a - last] += 1
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last = a
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steps[3] += 1 # last step is always 3
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print(steps[1:4])
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print(steps[1] * steps[3])
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