#25047: 可利用 外積==0 && 內積<=0,寫法非常簡潔


allllllan123456 (God of Computer Science)


https://alan23273850.github.io/Online-Judge-Problems/zerojudge/d170-%E9%A3%9B%E8%9B%BE%E6%92%B2%E7%81%AB%E4%B8%80/