1100. Rockets

单点时限: 2.0 sec

内存限制: 256 MB

There are two separate, n-element sets of points of a two dimensional map: R and W. None triple of points from the set RUW is collinear. Rockets earth-to-earth are located on points from the set R. Enemy objects, which should be destroyed, are located on points from the set W. The rockets may fly only in the straight line and their trajectories cannot intersect. We are about to find for each rocket a target to destroy.

Task

Write a program which:

reads coordinates of the points from the sets R and W,

finds the set of n pairwise not-intersecting segments, so that one end of each segment belongs to the set R, while the other belongs to the set W,

writes the result.

输入格式

In the first line of the input there is written one integer n, 1<=n<=10000, equal to the number of elements of the sets R and W.

In each of the following 2n lines one pair of integer numbers from the interval [-10000, 10000] is written. Numbers in each pair are separated by a single space. They are coordinates of the point on a map (first coordinate x, then y). The first n lines comprise coordinates of the points from the set R, the last n lines comprise the points from the set W. In the (i+1)-th line there are coordinates of the point ri, in the (i+n+1)-th line there are coordinates of the point wi, 1<= i<= n.

输出格式

The output should consist of n lines. In the i-th line there should be one integer k(i), such that the segment ri wk(i) belongs to the set of segments which your program found. (This means that the rocket from the point ri destroys an object in the point wk(i)).

样例

Input
4
0 0
1 5
4 2
2 6
1 2
5 4
4 5
3 1
Output
2
1
4
3

0 人解决,7 人已尝试。

0 份提交通过,共有 13 份提交。

9.9 EMB 奖励。

创建: 16 年,10 月前.

修改: 6 年,9 月前.

最后提交: 3 年,6 月前.

来源: POI 1999 II Stage

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