A New Door

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Now Chef is very good in cooking; his dishes are the best in the city, so he wants to make his restaurant prettier. The first, what customer sees, when comes to his restaurant is the door. So he will start with it. He has found a new design last night. Hi will cut out some circles from the door and fill the holes by the glass to make windows of peculiar form.
Formally, we can model the process Chef will perform to create the windows as follows. Let the door be a rectangle at the coordinate plane with corners at the points (0, 0), (W, 0), (0, H), (W, H). Initially the door is colored white, while the remaining part of the coordinate plane is colored black. At each step Chef colors in black some circle including all its inner points. After Chef will color all required circles, the black part of the door (that is, black regions that lie in the rectangle corresponding to the door) is cut out and replaced by the glass.
The main measure of peculiarity of the door is the perimeter of all the windows considering only those parts of windows borders lying inside the door (see example case 2 for clarity). Chef is very tired after coloring so many circles and asks you to find this number.
Input
The first line of the input contains an integer T denoting the number of test cases. The description of T test cases follows. The first line of each test case contains 3 spaceseparated integers W, H, N, denoting the measurements of the door, and the number of circles. The description of N circles follows in the next N lines. Namely, the ith line among them contains 3 spaceseparated real numbers X, Y, R with exactly two digits after the decimal point, denoting the coordinates of the center and the radius of the circle that Chef will cut out at the ith step.
Output
For each test case, output a single line containing the sum of the perimeters of all windows as described above. Your answer will be considered as correct if it has an absolute error less than 10^{6}.
Constraints
 1 ≤ T ≤ 1000
 1 ≤ W ≤ 1000
 1 ≤ H ≤ 1000
 1 ≤ N ≤ 1000
 The sum of all values of N over the input does not exceed 5000
 0 < R ≤ 1000
 0 ≤ X, Y ≤ 1000
 X, Y, R have exactly two digits after the decimal point
 All circles are different, that is, every two circles have either different radii or different centers (or both)
Example
Input: 2 8 10 8 2.00 2.00 1.00 4.00 2.00 0.50 6.00 2.00 1.00 4.00 5.00 1.50 3.00 6.00 0.50 3.00 7.00 0.75 5.00 7.00 1.00 4.00 8.00 1.00 7 7 3 1.00 1.00 2.00 3.00 3.00 1.50 6.00 5.00 1.50 Output: 33.6404284 17.2058395
Explanation
Example case 1. The answer is the length of the bold lines on the following picture:
Example case 2. The answer is the length of the bold lines on the following picture:
Author:  witalij_hq 
Tester:  anton_lunyov 
Editorial  http://discuss.codechef.com/problems/ANDOOR 
Tags  geometry jan13 medium precision witalij_hq 
Date Added:  9082012 
Time Limit:  6 sec 
Source Limit:  50000 Bytes 
Languages:  ADA, ASM, BASH, BF, C, C99 strict, CAML, CLOJ, CLPS, CPP 4.3.2, CPP 4.9.2, CPP14, CS2, D, ERL, FORT, FS, GO, HASK, ICK, ICON, JAVA, JS, LISP clisp, LISP sbcl, LUA, NEM, NICE, NODEJS, PAS fpc, PAS gpc, PERL, PERL6, PHP, PIKE, PRLG, PYTH, PYTH 3.1.2, RUBY, SCALA, SCM guile, SCM qobi, ST, TCL, TEXT, WSPC 
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cool
i think points should be
In the figure for the second
@shettynamit Ah! Please don't
@shettynamit In my previous
shouldnt it be (H,W) ?
@uniquephase The problem
@xiaodao Every input
the allowed error is just too
@ivan100sic I make sure you
@anton_adm I didn't say that
'Absolutely safe' involved me
The data of the problem is to
@ivan100sic @triplem @csimstu
@anton_adm In this case we
@argos I've investigated a
@admin In example 1 in this
@admin The sample output
@vineetpaliwal Probably the
@setac Your question about
@javadecoder Note that
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OMG
Is it possible to have
@esdhrgl No. As mentioned in
@abhisheklfs Every input
Hi all. Finally I've found
Hello , the line "Initially
Hi admin, I sent email to
@rahulbhadani. Alternative
@acebook When we have
I did it! I did it! I can't
@fierro_oxidado Hm... I also
Finally accepted.
@amitsaharana Yes it will be
@admin thanks, that much help
@admin will it be possible to
@migdal Yes, if it is not too
@anton After the contest, I
Good problem to learn about
@admin . I made a world
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@admin now can you give the