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交作业

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rrke

#1 Created at ... [Delete] [Delete and Lock User]
def triangles():
    L = [1]
    yield L
    while True:
        L.append(0)
        res = [L[0]]
        for k,v in enumerate(L):
            if(k!=0):
                res.append( L[k-1] + L[k] )
        yield res
        L = res

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