GPT-o3 综合 严格题归零

def reservoir_sample(stream, k, seed=None):
    rng = random.Random(seed)
    reservoir = []

    if k <= 0:
        return reservoir

    for i, item in enumerate(stream):
        if i < k:
            reservoir.append(item)
        else:
            j = rng.randrange(i + 1)
            if j < k:
                reservoir[j] = item

    return reservoir