HDU 1008 Elevator

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

代码：

#include <iostream>#include<cstdio>#include<cmath>using namespace std;int main(){    int n;    int a[105];    a[0]=0;    while(scanf("%d",&n) && n)    {        int sum=0;        for(int i=1;i<=n;i++)           {               cin>>a[i];               if(a[i]>a[i-1])                sum=sum+(a[i]-a[i-1])*6+5;               else                sum=sum+(a[i-1]-a[i])*4+5;           }           printf("%d\n",sum);    }    return 0;}