It can be shown that this recursive solution takes exponential time to run.
可以证明，这种递归解法需要耗费指数级的时间。
Can you name an example of a recursive solution that you created?
举出一个你所用过的递归的例子。
An image restored by a recursive solution of traveling wave equation is natural to visual interpretation, without ringing effect and distortion emerging, but accumulated noise appears on it obviously.
波动方程递推求解后得到的去运动模糊图像，复原结果比较自然，没有振铃效应和畸变，但是会出现明显的累积噪声。
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