[模板仓库] 计算几何

未完待续   点： 1 struct point{ 2 double x,y; 3 point operator + (point b){return (point){x+b.x,y+b.y};}; 4 point operator - (point b){return (point){x-b.x,y-b.y};}; 5 point operator * (doub

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