Elevator

http://acm.hdu.edu.cn/showproblem.php?pid=1008

#include <bits/stdc++.h>
#define lid id<<1
#define rid id<<1|1
#define maxn 50005
using namespace std;
int main()
{
    int n;
    while(~scanf("%d",&n)&&n)
    {
        int now=0;
        int ans=0;
        for(int i=0;i<n;i++)
        {
            int floor;
            scanf("%d",&floor);
            if(floor-now>0)
            {
                ans+=(floor-now)*6;
                ans+=5;
                now=floor;
            }
            else
            {
                ans+=(now-floor)*4;
                ans+=5;
                now=floor;
            }
        }
        printf("%d
",ans);
    }
    return 0;
}