209. Areas

time limit per test: 0.25 sec.
memory limit per test: 65536 KB
input: standard
output: standard

Consider N different lines on the plane. They divide it to several parts,some of which are finite, some infinite.

Your task in this problem is for each finite part to find its area.


The first line of the input file contains N — the number of lines (1 ≤ N ≤ 80). Each of next N lines contains four integer numbers x1, y1, x2 and y2 — the coordinates of two different points of the line.

All coordinates do not exceed 102 by their absolute value.

No two lines coincide.


First output K — the number of finite parts among those the lines divide the plane to.

Next K lines of the output file must contain area parts sorted in non-decreasing order. You answer must be accurate up to 10-4.

Due to floating point precision losses possible, do not consider parts with area not exceeding 10-8.

Sample test(s)

0 0 1 0
1 0 1 1
1 1 0 1
0 1 0 0
0 0 1 1


Author:Andrew Stankevich
Resource:Petrozavodsk Summer Trainings 2003