1008. Elevator (20)

简析：10分钟内ac，没有难度。

#include <iostream>
using namespace std;

int main(int argc, const char * argv[]) {
    int n, f0 = 0, f1, sum = 0;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    
    
    for (int i = 0; i < n; i++) {
        f1 = a[i];
        if (f1 - f0 > 0) {
            sum += (f1 - f0) * 6;
        }else{
            sum += (f1 - f0) * -4;
        }
        f0 = f1;
    }
    
    sum += n * 5;
    
    cout << sum << endl;
    
    return 0;
}