一天，丁俊晖编一整天的程序，突然觉得累了，于是便决定在房间内四处走走。他的房间是矩形的，他从电脑开始随便选了一个角度开始行走。由于职业习惯，丁俊晖走路始终是直线，而且碰到墙以后会反弹，入射角度与出射角度完全相同。丁俊晖会一直行走，直到灵感再次迸发。假设他的行走速度是匀速的，现在，丁俊晖的母亲想知道他一共休息了多长时间以便提醒他继续工作。



丁俊晖想考考他的母亲，于是他记录了自己碰到墙壁的序列并且告诉了她，你有没有办法能够帮助她计算出小丁所走的路程？

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One day, Ding compiled a full day program, I suddenly felt tired, so they decided to walk around the room. His room is rectangular, and he began to pick from a computer point of view began to walk. As a habit, Ding Junhui is always walking a straight line, and hit the wall after the rebound, the incident angle and exit angle of the same. Ding Junhui will always walk again until the burst of inspiration. Assuming he s walking speed is uniform, and now, Ding s mother wanted to know how long he was a total break to remind him to continue working.



Ding Junhui trying to quiz his mother, so he recorded his own hit series wall and told her, you have no way to help her calculate the Ding s journey?































One day, Ding compiled a full day program, I suddenly felt tired, so they decided to walk around the room. His room is rectangular, and he began to pick from a computer point of view began to walk. As a habit, Ding Junhui is always walking a straight line, and h