Elevator
http://acm.hdu.edu.cn/showproblem.php?pid=1008
1 /*written by czk*/
2 #include <stdio.h>
3
4 int main() {
5 int n, i;
6 while(scanf("%d", &n) != EOF) {
7 int time = 0;
8 int current = 0;
9 int next;
10 if(n == 0)
11 break;
12 for(i = 0; i < n; i++) {
13 scanf("%d", &next);
14 if(next > current)
15 time += (next - current) * 6 + 5;
16 else
17 time += (current - next) * 4 + 5;
18 current = next;
19 }
20 printf("%d\n", time);
21 }
22 }