出處 ： https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2321
G - Probability
Time Limit: 1 sec
Memory Limit: 16MB
Consider rectangular coordinate system and point L(X,Y) which is randomly chosen among all points in the area A which is defined in the following manner: A = {(x,y) | x is from interval [-a;a]; y is from interval [-b;b]}. What is the probability P that the area of a rectangle that is defined by points (0,0) and (X,Y) will be greater than S?
INPUT:
The number of tests N <= 200 is given on the first line of input. Then N lines with one test case on each line follow. The test consists of 3 real numbers a > 0, b > 0 ir S => 0.
OUTPUT:
For each test case you should output one number P and percentage "%" symbol following that number on a single line. P must be rounded to 6 digits after decimal point.
SAMPLE INPUT:
3
10 5 20
1 1 1
2 2 0
SAMPLE OUTPUT:
23.348371%
0.000000%
100.000000%
Problem setters: Aleksej Viktorchik, Leonid Shishlo.
Huge Easy Contest #1
解題策略
積分
說明文件 https://docs.google.com/document/d/10iu1a64II6sBN9GPLJ8yl_TWHQVx91_8e2oWFjtYy1w/edit?usp=sharing