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终于AC了！！！！注意几点： 1.判断是否相交擦过某些顶点： <10e-8 就算在管道内 2.要判断光能不能从开口走到x点（意思就是这两点连起来不能过前面的） 3.x可以是负数，max=-INF Followed by: Post your reply here: |
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