Russia Team Open, High School Programming Contest St Petersburg, Barnaul, Tbilisi, Almaty, Kremenchug, November
ContestLinkeasy:AFImedium-easy:BDHmedium:CGKL???:EJA.AttractiveFlowers签到。B.BlockingtheView题意问线段ab沿向量v移动是否会与线段cd相交做法把ac,ad,bc,bd四个向量排序一下,判断v是否在范围内就好坑点在线段共线的情况C.Fermat’sLastTheorem题意将有序四元组\((a,b,c,n)\)按