• hdu 6206 apple 点在内接圆外


    //有时间要整理一下 java难道也需要几何板吗?这不是难为人吗?
     //http://bbs.csdn.net/topics/60323633 
    
    import java.math.BigInteger;
    import java.util.Scanner;
    
    
    public class Main {
        public static void debug(BigInteger[] a) {
            System.out.println(a[0]+" "+a[1]);
        }
        public static BigInteger[] getab(BigInteger[] a,BigInteger[] b) {
            BigInteger[] ab=new BigInteger[2];
            ab[0]=b[0].subtract(a[0]);ab[1]=b[1].subtract(a[1]);
            return ab;
        }// AB=(x2-x1,y2-y1)
        public static BigInteger getamulb(BigInteger[] a,BigInteger[] b){
            BigInteger ans=a[0].multiply(b[0]);
            ans=ans.add(a[1].multiply(b[1]));
            return ans;
        }//AB*AC=(x2-x1)(x3-x1)+(y2-y1)(y3-y1)
        public static BigInteger sgn(BigInteger x) {//sgn(x)=(x<0)?-1:((x==0)?0:1);
            int res=x.compareTo(BigInteger.valueOf(0));
            return BigInteger.valueOf(res);
        }
        public static BigInteger Fxy(BigInteger[] b,BigInteger[] c,BigInteger[] p) {
            BigInteger tmp= (p[0].subtract(b[0])).multiply(c[1].subtract(b[1]));
            return tmp.subtract((p[1].subtract(b[1])).multiply(c[0].subtract(b[0])));
        }//f(x,y)=(x-x2)*(y3-y2)-(y-y2)*(x3-x2),
        
        public static int getmeow(BigInteger[] a,BigInteger[] b,BigInteger[] c,BigInteger[] d,int flag){
            BigInteger[] ab=getab(a,b);
            BigInteger[] ac=getab(a, c);
            BigInteger[] db=getab(d, b);
            BigInteger[] dc=getab(d, c);
    
            //System.out.println(getamulb(dc, dc));
            //debug(ab);debug(ac);debug(db);debug(dc);
            BigInteger amb=getamulb(a, b),dmb=getamulb(d, b);
            BigInteger amc=getamulb(a, c),dmc=getamulb(d, c);
            BigInteger abac=getamulb(ab, ac),dbdc=getamulb(db, dc);
            BigInteger l=sgn(abac),r=sgn(dbdc);
            //System.out.println("1l: "+l+ " r: "+r);
            
            l=l.multiply(abac.multiply(abac));r=r.multiply(dbdc.multiply(dbdc));
    
            //System.out.println("2l: "+l+ " r: "+r);
    
            l=l.multiply(getamulb(db, db));r=r.multiply(getamulb(ab,ab));
    
            //System.out.println("3l: "+l+ " r: "+r);
            l=l.multiply(getamulb(dc, dc));r=r.multiply(getamulb(ac,ac));
            //flag==1 sgn(AB.AC)*(AB.AC)^2 *|DB|^2 *|DC|^2 > sgn(DB.DC) *(DB.DC)^2 *|AB|^2 *|AC|^2
            //flag==0  -sgn(AB.AC)*(AB.AC)^2 *|DB|^2 *|DC|^2 < sgn(DB.DC) *(DB.DC)^2 *|AB|^2 *|AC|^2
            //System.out.println("4l: "+l+ " r: "+r+ " flag:"+flag);
            if(flag==1) {
                return r.compareTo(l); //l>r
            
            }
            else return (l.add(r)).compareTo(BigInteger.valueOf(0)); //l+r>0
        }
        public static void main(String[] args) {
            // TODO 自动生成的方法存根
            Scanner cin=new Scanner(System.in);
            BigInteger[][]p=new BigInteger[4][2];
            int t=cin.nextInt();
            for(int cas=0;cas<t;cas++){
                for(int i=0;i<4;i++){
                    p[i][0]=cin.nextBigInteger();
                    p[i][1]=cin.nextBigInteger();
                }
                BigInteger fa=Fxy(p[1], p[2], p[0]),fb=Fxy(p[1], p[2], p[3]);
                BigInteger flg=sgn(fa.multiply(fb));
                int flag=flg.compareTo(BigInteger.valueOf(0));
                int res=getmeow(p[0],p[1], p[2], p[3], flag);
                System.out.println(res==1? "Accepted":"Rejected");
                
                
                
                
            }
    
    }
    }
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  • 原文地址:https://www.cnblogs.com/MeowMeowMeow/p/7536900.html
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