杭电 ACM 1008

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

代码：

#include<iostream>

using namespace std;

int main(void)

{

int n;

int num, lastnum;

int time;

while(cin >> n && n != 0)

{

time = 0;

lastnum = 0;

for(int i = 0;i < n;i++)

{

cin >> num;

if(num == lastnum)

time += 5;

if(num > lastnum)

time += 6*(num - lastnum) + 5;

if(num < lastnum)

time += 4*(lastnum - num) + 5;

lastnum = num;

}

cout << time << endl;

}

return 0;

}