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2515. Do It
单点时限: 10.0 sec
内存限制: 256 MB
There is sometimes difficulty giving nice backgrounds to contest problems. So let this problem kept this simple - write a program that calculates the value of the following formula where the parameters N, R, Ai, ωi, and φi are all given:
输入格式
The input consists of a series of datasets each of which has the following format:
N R
A1 ω1 φ1
A2 ω2 φ2
…
AN ωN φN
The numbers in the input are all integers and satisfy the following conditions: 1 ≤ N ≤ 16, 1 ≤ R ≤ 104, 1 ≤ Ai ≤ 10, 0 ≤ ωi ≤ 100 and 0 ≤ φi ≤ 360.
The end of input is indicated by N = R = 0. This is not part of any dataset and hence should not be processed.
输出格式
For each dataset, print the result of the integration in a line. The result may be printed with an arbitrary number of fractional digits, but should have a relative or absolute error not greater than 10-8.
样例
Input
1 1 1 1 0 0 0
Output
0.45969769413186
创建: 15 年，1 月前.
修改: 6 年，3 月前.
最后提交: 3 年，5 月前.
来源: N/A
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