/*
题目大意:
一部电梯
最开始停0层
上一层6s
下一层4s
每次到达楼层就停5s
求总花费时间
*/
#include"stdafx.h"
#include<iostream>
#include<math.h>
#include<algorithm>
using namespace std;
int n, a[105], i, j;
int main()
{
cin >> n;
for (i = 1; i <= n; ++i)
cin >> a[i];
int positive = 0, nagative = 0, now;
for (i = 1; i <= n; ++i)
{
now = a[i] - a[i - 1];
if (now > 0)
positive = positive + now;
else
nagative = nagative - now;
}
cout << positive * 6 + nagative * 4 + n * 5 << endl;
return 0;
}
PTA 1008 Elevator
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