PAT甲级1008水题飘过

题目分析：上去下来到达的时间和数量

#include<iostream>
using namespace std;

int k[105];

int main(){
    int n;
    while(scanf("%d", &n) != EOF){
        int ans = 0;
        int floor = 0;
        ans += n*5;
        for(int i = 1; i <= n; i++){
            scanf("%d", &k[i]);
            if(k[i] > floor){
                ans += (k[i] - floor) * 6;
                floor = k[i];
            }
            else if(k[i] < floor){
                ans += (floor - k[i]) * 4;
                floor = k[i];
            }
        } 
        printf("%d\n", ans);
    }
    return 0;
}