Atlantis

Time Limit: 2 Seconds
Memory Limit: 65536 KB

There are several ancient Greek texts that contain descriptions of the fabled
island Atlantis. Some of these texts even include maps of parts of the island.
But unfortunately, these maps describe different regions of Atlantis. Your friend
Bill has to know the total area for which maps exist. You (unwisely) volunteered
to write a program that calculates this quantity.

**Input**

The input file consists of several test cases. Each test case starts with a
line containing a single integer n (1<=n<=100) of available maps. The
n following lines describe one map each. Each of these lines contains four numbers
x1;y1;x2;y2 (0<=x1<x2<=100000;0<=y1<y2<=100000), not necessarily
integers. The values (x1; y1) and (x2;y2) are the coordinates of the top-left
resp. bottom-right corner of the mapped area.

The input file is terminated by a line containing a single 0. Don��t process
it1.

**Output**

For each test case, your program should output one section. The first line of
each section must be ��Test case #k��, where k is the number of the test case
(starting with 1). The second one must be ��Total explored area: a��, where a
is the total explored area (i.e. the area of the union of all rectangles in
this test case), printed exact to two digits to the right of the decimal point.

Output a blank line after each test case.

**Sample Input**

2

10 10 20 20

15 15 25 25.5

0

**Sample Output**

Test case #1

Total explored area: 180.00

Source:

**Mid-Central European Regional Contest 2000**
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