HDOJ1008 ( Elevator )

 1 #include <stdio.h>
 2 int main()
 3 {
 4     int n,pre,cur,t,m;
 5     while (scanf("%d",&n),n)
 6     {
 7         pre=0;
 8         t=0;
 9         while (n--)
10         {
11             scanf("%d",&cur);
12             m=cur-pre;
13             if(m>0)    t+=m*6;
14             else    t+=m*-4;
15             t+=5;
16             pre=cur;
17         }
18         printf("%d\n",t);
19     }
20     return 0;
21 }