说明: 2018 world final 金牌 吉老师几何板子 struct point{ db x,y; point operator + (const point &k1;) const{return (point){k1.x+x,k1.y+y};} point operator - (const point &k1;) const{return (point){x-k1.x,y-k1.y};} point operator * (db k1) const{return (point){x*k1,
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