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p1016
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#include<cstdio>
#include<iostream>
using namespace std;
double d[10],pi[10];
int main()//愉快地开始了主函数
{
double d1,c,d2,p,pmin=1000,l=0,pz=0;//l指的是油箱中的油量,初始值为0;pz指的是所花的钱的总数,初始值为0
int n;
cin>>d1>>c>>d2>>p>>n;
d[0]=0;
double d0=0;
pi[0]=p;
double x=c*d2;//x指的是加满油能最多能走的里程
for(int i=1;i<=n;i++)
{
cin>>d[i]>>pi[i];
}
for(int i=1;i<=n;i++)
{
if(d[i]-d[i-1]>x){cout<<"No Solution";return 0;}
}
int ii=0;
while(d1-d0)
{
for(int i=ii+1;d[i]-d0<=x&&i<=n;i++)
{
if(pi[i]<pmin){pmin=pi[i];ii=i;}
}
if(pmin<=p){pz+=((d[ii]-d0)/d2-l)*p;l=(d[ii]-d0)/d2;}
else if(d1-d0>x)
{
pz+=(c-l)*p;
l=c;
}
else
{
pz+=((d1-d0)/d2-l)*p;
break;
}
l=l-(d[ii]-d0)/d2;
d0=d[ii];
p=pmin;
pmin=1000;
}
printf("%.2lf",pz);
return 0;
}