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

【题目链接】:http://codeforces.com/contest/820/problem/A

【题意】



每天看书能看v页;

且这个v每天能增加a;

但是v有上限v1;

然后每天还必须往回看t页;

问你最少多少天能看完;

一共有c页;

【题解】



傻逼题.



【Number Of WA】



1



【反思】



在处理超过v1的时候没搞好.



【完整代码】

#include <bits/stdc++.h>
using namespace std;
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define LL long long
#define rep1(i,a,b) for (int i = a;i <= b;i++)
#define rep2(i,a,b) for (int i = a;i >= b;i--)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define ms(x,y) memset(x,y,sizeof x)
#define Open() freopen("F:\\rush.txt","r",stdin)
#define Close() ios::sync_with_stdio(0)

typedef pair<int,int> pii;
typedef pair<LL,LL> pll;

const int dx[9] = {0,1,-1,0,0,-1,-1,1,1};
const int dy[9] = {0,0,0,-1,1,-1,1,-1,1};
const double pi = acos(-1.0);
const int N = 110;

LL c,v0,v1,a,l;

void dfs(LL x,LL v,LL day){
    if (x >= c){
        cout << day << endl;
        return;
    }
    x-=l;
    LL temp = min(v1,v + a);
    dfs(x + temp,temp,day+1);
}

int main(){
    //Open();
    Close();
    cin >> c >> v0 >> v1 >> a >> l;
    dfs(v0,v0,1);
    return 0;
}