杭电1008 Elevator

以前做这题的时候，答案跟它的示例一样，却发现老是Wrong Answer。今天再做的时候，终于想明白了原因，就是没有考虑到电梯连续去同一楼的情况，比如：3 0 0 0， 答案应该是 3*5=15， 而不是 0 ！

因此重做一遍后，果然AC了！

以下是代码：

/* THE PROGRAM IS MADE BY PYY */

/*
        http://acm.hdu.edu.cn/showproblem.php?pid=1008
        Elevator

*/

/* Test data:


*/

#include <iostream>
using namespace std;
int main()
{
        int test_case, i, curFloor, lastFloor, time, differ;
        const int up = 6, down = 4, stay = 5;
        while (cin >> test_case && test_case) {
                time = i = curFloor = lastFloor = 0;
                while (i++ < test_case) {
                        cin >> curFloor;
                        differ = curFloor - lastFloor;
                        if (differ > 0) {
                                time += differ * up + stay;
                        } else if (differ < 0) {
                                time += (-1) * differ * down + stay;
                        } else {
                                time += stay;
                        }
                        lastFloor = curFloor;
                }
                cout << time << endl;
        }

        return 0;
}