hdu 1008 Elevator

一开始想的时候吧那个搞错了，那个在同一层的时候对停留5S

#include <stdio.h>
#include <string.h>

int a[3005];

int main()
{
    int n;
    while(scanf("%d",&n) && n)
    {
        int i;
        long  sum = 0;
        memset(a,0,sizeof(a));
        for(i = 1; i <= n; i++)
            scanf("%d",&a[i]);
        for(i = 1; i <= n; i++)
            {
                if(a[i] > a[i-1])
                   sum += 6* (a[i] - a[i-1])+5;
                if(a[i] < a[i-1])
                  sum += 4* (a[i-1] - a[i]) +5;
                if(a[i] == a[i-1])
                  sum += 5;
            }
        printf("%ld\n",sum);
    }

    return 0;
}