For horizontal movement we can do even better. If your snake is moving to the right, we start by deleting every character on the left edge of the screen and inserting a new one on the right edge. After that, we do our patching (if needed). This automatically moves fruit into the correct position without us even needing to reprint it!
Michael Buchanan,Social affairs correspondentand
，更多细节参见WPS下载最新地址
优点：计算简单，导数恒为1（正区间），缓解梯度消失
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