Codeforces Round #421 (Div. 2) A. Mister B and Book Reading

题目大意

题解

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int read()
{
char ch=getchar();int f=0;
while(ch<'0'||ch>'9') ch=getchar();
while(ch>='0'&&ch<='9')
{f=(f<<1)+(f<<3)+ch-'0';
ch=getchar();}
return f;
}
int main()
{
int c=read(),v0=read(),v1=read(),a=read(),l=read();
int now=v0,day=1,page=v0;
while(now<c)
{
day++;
page+=a;
if(page>v1)
page=v1;
now+=page;
now-=l;
if(now>=c)
break;
}
printf("%d",day);
}