Description
The gopher family, having averted the canine threat, must face a new predator.
Input
The input contains several cases. The first line of each case contains four positive integers less than 100: n, m, s, and v. The next n lines give the coordinates of the gophers; the following m lines give the coordinates of the gopher holes. All distances are in metres; all times are in seconds; all velocities are in metres per second.
Output
Output consists of a single line for each case, giving the number of vulnerable gophers.
Sample Input
2 2 5 10
1.0 1.0
2.0 2.0
100.0 100.0
20.0 20.0
Sample Output
1
http://blog.csdn.net/abcjennifer/article/details/19423987
