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判断半球面是否有公共区域：向量的叉乘计算两个半球面交点的方向，点乘的正负号判断半球面是否能覆盖某个方向向量，有理数的计算是有精确解的，不要轻易相信关于精度的讨论longlong计算叉乘足够的， 可惜不足以计算点乘的正负号 Followed by: Post your reply here: |
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