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其实跟DP的方向没有关系的 关键在于要使用记忆化DP TLE RE原因见内 当递归算出一个板到地面的距离，用两个数组分别记录左右的结果，下次程序再到这个板时，如果数组已有结果了,就不用再递归去求了.......
一开始没存，直接暴力稳稳超，一改过来就瞬秒了
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