杭电ACM 1008 Elevator

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

电梯问题，好弱智的一道题~~

#include<iostream>
using namespace std;
int main(){
	int T;
	cin>>T;
	int m,pre,time;
	while(T){
		pre=0;time=0;
		for(int i=0;i<T;i++){
		 cin>>m; 
		 if(m-pre<0)  time+=(pre-m)*4;
		 else time+=(m-pre)*6;
		 pre=m;	
		}
		cout<<5*T+time<<endl;
		cin>>T;
	}
}