... 带伐 Border-cutting 林缘树 Border-tree 重纹孔 (有边纹孔) Bordered pit ...
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border tree 林缘树
tree of forest border 林缘树
For the purposes of this problem, you may assume that the trees are of point size, and that any tree (point) lying exactly on the border of a triangle is considered to be in the triangle.
为简化题目，你可以认为树都一个无穷小的点，而精确位于三角形边上的树应算作在三角形内的。
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