【PAT】1008 Elevator

【PAT】1008 Elevator（20）

#include <iostream>
using namespace std;

int main()
{
    int n, num, now = 0, res = 0;
    cin >> n;
    for (; n--; now = num)
    {
        cin >> num;
        if (num > now)
            res += (num - now) * 6 + 5;
        else
            res += (now - num) * 4 + 5;
    }
    cout << res;
    return 0;
}