Dog & Gopher

Description
一只地鼠想沿直线跑到位于点(x2,y2)的一个坑中,但是在(x1,y1)有一条狗想吃它,狗的速度是地鼠速度的两倍,如果狗比地鼠提前或者同时到达(x2,y2),地鼠就会被狗吃了,地鼠可以选一些坑作为起点,问地鼠能否成功逃脱,如果可以,输出离(x2,y2)最近的坑,如果最近距离有多个则输出首先输入的坑
Input
第一行为四个浮点数分别表示x1,y1,x2,y2,即狗的初始位置和地鼠的目标位置,之后输入多行,每行两个浮点数表示一个地鼠可以选择的初始坑,以文件尾结束输入
Output
如果地鼠从任何一个坑出发都会被狗吃掉则输出The gopher cannot escape.如果地鼠能够成功逃脱,则输出The gopher can escape through the hole at (x,y).(其中(x,y)为离(x2,y2)最近的坑,如果最近距离有多个则输出先输入的坑)
Sample Input
1.000 1.000 2.000 2.000
1.500 1.500
Sample Output
The gopher cannot escape.

x

2个回答

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