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看了半天也不会，百度了一下杨辉三角，顺便找到了百度百科提供的算法，研究一下

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公纸晓白

#1 Created at ... [Delete] [Delete and Lock User]

    L = [1]

    while True:

        yield L

        L = [sum(i) for i in zip([0]+L, L+[0])]

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