[Pair Programming 2] Bus程序更正1

感谢王栋同学报告bug:

int high = buildInfo.numFloors - 1;
while (!buildInfo.canStop[id][high])
    high++;

应该改为

int high = buildInfo.numFloors - 1;
while (!buildInfo.canStop[id][high])
    high--;

我看了以后表示这个帖子标题得以“1” 结尾，因为估计还会有2。。。