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https://github.com/Kiritow/OJ-Problems-Source.git
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29 lines
1020 B
C++
29 lines
1020 B
C++
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#include<stdio.h>
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#include<iostream>
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#include<math.h>
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#include<string.h>
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using namespace std;
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int main()
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{
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double x1,y1,x2,y2,Lx,Ly,vD,vB,L;
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while(scanf("%lf%lf%lf%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&Lx,&Ly,&vD,&vB,&L))
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{
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if(x1==0&&y1==0&&x2==0&&y2==0&&Lx==0&&Ly==0&&vD==0&&vB==0&&L==0)break;
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double a=vD*vD-Lx*Lx-Ly*Ly;
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double b=2*L*vD-2*Lx*(x1-x2+L*Lx/vB)-2*Ly*(y1-y2+L*Ly/vB);
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double c=L*L-(x1-x2+L*Lx/vB)*(x1-x2+L*Lx/vB)-(y1-y2+L*Ly/vB)*(y1-y2+L*Ly/vB);
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double s1=(-b-sqrt(b*b-4*a*c))/(2*a);
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double s2=(-b+sqrt(b*b-4*a*c))/(2*a);
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b=-2*L*vD-2*Lx*(x1-x2+L*Lx/vB)-2*Ly*(y1-y2+L*Ly/vB);
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double s3=(-b-sqrt(b*b-4*a*c))/(2*a);
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double s4=(-b+sqrt(b*b-4*a*c))/(2*a);
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printf("%.3lf ",L);
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if(s1<0)s1=10000000000.0;
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if(s2<0)s2=10000000000.0;
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if(s3<0)s3=10000000000.0;
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if(s4<0)s4=10000000000.0;
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printf("%.3lf\n",min(s1,min(s2,min(s3,s4)))+L/vB);
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}
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return 0;
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}
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