纯粹的阅读理解题…………
#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<iomanip>
#include<cmath>
#include<string>
using namespace std;
int main()
{
int n,i,j,t,k,m[101],l;
double cost,sum,car,p[101],s;
while(cin>>t>>cost>>sum>>k)
{
if(t<0)
break;
j=0;
for(i=0;i<k;i++)
{
cin>>l>>s;
if(i==0)
p[j++]=s;
else
{
while(j<l)
{
p[j]=p[j-1];
j++;
}
p[j++]=s;
}
}
while(j<=t) {
p[j]=p[j-1];
j++;
}
car=(sum+cost)*(1-p[0]);
cost=sum/t;
if(car>=sum)
{
cout<<"0 months"<<endl;
continue;
}
j=1;
for(i=1;i<=t;i++)
{
s=p[i];
car*=(1-s);
sum-=cost;
if(car>=sum)
break;
}
if(i==1)
cout<<"1 month"<<endl;
else cout<<i<<" months"<<endl;
}
return 0;
}