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直接记忆化搜索，O(n)

Posted by number at 2007-06-04 14:31:25 on Problem 1088
In Reply To:用 topologic sort来作不可以么？ Posted by:bigbig85 at 2007-06-04 13:59:53 
> 滑雪地地图就是一个有向无环图。
> 最长路径一定在拓扑有序序列中。
> 貌似时间复杂度只有o(n+4n).
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