2687. White Water Rafting

单点时限: 2.0 sec

内存限制: 256 MB

You have been hired by a big theme park to design a new attraction: a white water rafting ride. You already designed the track; it is a round trip that is described by an inner and an outer polygon. The space in between the two polygons is the track.

You still need to design the rafts, however. It has been decided that they should be circular, so that they can spin freely along the track and increase the fun and excitement of the ride. Besides that, they should be as big as possible to fit the maximum number of people, but they can’t be too big, for otherwise they would get stuck somewhere on the track.

What is the maximum radius of the rafts so that they can complete the track?

输入格式

On the first line one positive number: the number of testcases, at most 100. After that per testcase:

One line with an integer ni (3 ≤ ni ≤ 100): the number of points of the inner polygon.

ni lines with two integers each: the coordinates of the points of the inner polygon in consecutive order.

One line with an integer no (3 ≤ no ≤ 100): the number of points of the outer polygon.

no lines with two integers each: the coordinates of the points of the outer polygon in consecutive order.

All coordinates have absolute value no larger than 1 000. The points of the polygons can be given in either clockwise or counterclockwise order and the two polygons do not intersect or touch themselves or each other. The outer polygon encloses the inner polygon.

输出格式

Per testcase:

One line with a floating point number: the maximal radius of the white water rafts.

This number must have a relative or absolute error less than 10-6 .

样例

Input
2
4
-5 -5
5 -5
5 5
-5 5
4
-10 -10
-10 10
10 10
10 -10
3
0 0
1 0
1 1
5
3 -3
3 3
-4 2
-1 -1
-2 -2
Output
2.5
0.70710678

6 人解决,6 人已尝试。

6 份提交通过,共有 7 份提交。

5.3 EMB 奖励。

创建: 10 年,4 月前.

修改: 2 年,1 月前.

最后提交: 6 年,3 月前.

来源: NWERC 2008

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