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2392. Roll-A-Big-Ball
单点时限: 2.0 sec
内存限制: 256 MB
ACM University holds its sports day in every July. The “Roll-A-Big-Ball” is the highlight of the day. In the game, players roll a ball on a straight course drawn on the ground. There are rectangular parallelepiped blocks on the ground as obstacles, which are fixed on the ground. During the game, the ball may not collide with any blocks. The bottom point of the ball may not leave the course.
To have more fun, the university wants to use the largest possible ball for the game. You must write a program that finds the largest radius of the ball that can reach the goal without colliding any obstacle block.
The ball is a perfect sphere, and the ground is a plane. Each block is a rectangular parallelepiped. The four edges of its bottom rectangle are on the ground, and parallel to either x- or y-axes. The course is given as a line segment from a start point to an end point. The ball starts with its bottom point touching the start point, and goals when its bottom point touches the end point.
The positions of the ball and a block can be like in Figure E-1 (a) and (b).
输入格式
The input consists of a number of datasets. Each dataset is formatted as follows.
$N \
sx \ sy \ ex \ ey \
minx_{1} \ miny_{1} \ maxx_{1} \ maxy_{1} \ h_{1} \
minx_{2} \ miny_{2} \ maxx_{2} \ maxy_{2} \ h_{2} \
\vdots \
minx_{N} \ miny_{N} \ maxx_{N} \ maxy_{N} \ h_{N}$
A dataset begins with a line with an integer N, the number of blocks ($1 \le N \le 50$). The next line consists of four integers, delimited by a space, indicating the start point $(sx, sy)$ and the end point $(ex, ey)$. The following $N$ lines give the placement of blocks. Each line, representing a block, consists of five integers delimited by a space. These integers indicate the two vertices $(minx, miny)$, $(maxx, maxy)$ of the bottom surface and the height $h$ of the block. The integers $sx, sy, ex, ey, minx, miny, maxx, maxy$ and $h$ satisfy the following conditions.
$-10000 \le sx, sy, ex, ey \le 10000, \
-10000 \le minx_i < maxx_i \le 10000, \
-10000 \le miny_i < maxy_i \le 10000, \
1 \le h_i \le 1000$
The last dataset is followed by a line with a single zero in it.
输出格式
For each dataset, output a separate line containing the largest radius. You may assume that the largest radius never exceeds $1000$ for each dataset. If there are any blocks on the course line, the largest radius is defined to be zero. The value may contain an error less than or equal to $0.001$. You may print any number of digits after the decimal point.
样例
Input
2 -40 -40 100 30 -100 -100 -50 -30 1 30 -70 90 -30 10 2 -4 -4 10 3 -10 -10 -5 -3 1 3 -7 9 -3 1 2 -40 -40 100 30 -100 -100 -50 -30 3 30 -70 90 -30 10 2 -400 -400 1000 300 -800 -800 -500 -300 7 300 -700 900 -300 20 3 20 70 150 70 0 0 50 50 4 40 100 60 120 8 130 80 200 200 1 3 20 70 150 70 0 0 50 50 4 40 100 60 120 10 130 80 200 200 1 3 20 70 150 70 0 0 50 50 10 40 100 60 120 10 130 80 200 200 3 1 2 4 8 8 0 0 10 10 1 1 1 4 9 9 2 2 7 7 1 0
Output
30 1 18.16666666667 717.7857142857 50.5 50 18.16666666667 0 0
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