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用 topologic sort来作不可以么？

Posted by bigbig85 at 2007-06-04 13:59:53 on Problem 1088 
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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