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2857:Mirror and Light

题目描述
The light travels in a straight line and always goes in the minimal path between two points, are the basic laws of optics.

Now, our problem is that, if a branch of light goes into a large and infinite mirror, of course,it will reflect, and leave away the mirror in another direction. Giving you the position of mirror and the two points the light goes in before and after the reflection, calculate the reflection point of the light on the mirror.
  
You can assume the mirror is a straight line and the given two points can’t be on the different sizes of the mirror.
输入解释
The first line is the number of test case t(t<=100).
  
The following every four lines are as follow:
  X1 Y1
  X2 Y2
  Xs Ys
  Xe Ye

  (X1,Y1),(X2,Y2) mean the different points on the mirror, and (Xs,Ys) means the point the light travel in before the reflection, and (Xe,Ye) is the point the light go after the reflection.

  The eight real number all are rounded to three digits after the decimal point, and the absolute values are no larger than 10000.0.
输出解释
  Each lines have two real number, rounded to three digits after the decimal point, representing the position of the reflection point.
输入样例
1
0.000 0.000
4.000 0.000
1.000 1.000
3.000 1.000
输出样例
2.000 0.000 
来自杭电HDUOJ的附加信息
Recommend gaojie

该题目是Virtual Judge题目,来自 杭电HDUOJ

源链接: HDU-2857

最后修改于 2020-10-25T22:57:33+00:00 由爬虫自动更新

共提交 0

通过率 --%
时间上限 内存上限
2000/1000MS(Java/Others) 32768/32768K(Java/Others)