【HDOJ6581】Vacation（模拟）

题意：有标号从0到n的n+1辆车，每辆车离终点的距离为s[i]，车长为l[i]，速度为v[i]，规定不能超车，问何时所有车都能过终点线

n<=1e5，保证

思路：

 #include<bits/stdc++.h>
 using namespace std;
 typedef long long ll;
 typedef unsigned int uint;
 typedef unsigned long long ull;
 typedef pair<int,int> PII;
 typedef pair<ll,ll> Pll;
 typedef vector<int> VI;
 typedef vector<PII> VII;
 typedef pair<ll,int>P;
 #define N  2100000
 #define M  151000
 #define fi first
 #define se second
 #define MP make_pair
 #define pi acos(-1)
 #define mem(a,b) memset(a,b,sizeof(a))
 #define rep(i,a,b) for(int i=(int)a;i<=(int)b;i++)
 #define per(i,a,b) for(int i=(int)a;i>=(int)b;i--)
 #define lowbit(x) x&(-x)
 #define Rand (rand()*(1<<16)+rand())
 #define id(x) ((x)<=B?(x):m-n/(x)+1)
 #define ls p<<1
 #define rs p<<1|1

 const ll MOD=1e9+,inv2=(MOD+)/;
       double eps=1e-;
       ll INF=1e18;
       ll inf=5e13;
       int dx[]={-,,,};
       int dy[]={,,-,};

 int l[N],s[N],v[N];

 int read()
 {
    int v=,f=;
    char c=getchar();
    while(c<||<c) {if(c=='-') f=-; c=getchar();}
    while(<=c&&c<=) v=(v<<)+v+v+c-,c=getchar();
    return v*f;
 }

 int main()
 {
     //freopen("1.in","r",stdin);
     //freopen("1.out","w",stdout);
     int n;
     while(scanf("%d",&n)!=EOF)
     {
         rep(i,,n+) l[i]=read();
         rep(i,,n+) s[i]=read();
         rep(i,,n+) v[i]=read();
         double sum=,ans=1.0*s[]/v[];
         rep(i,,n+)
         {
             sum+=l[i];
             ans=max(ans,1.0*(sum+s[i])/v[i]);
         }
         printf("%.10f\n",ans);
     }

     return ;
 }