编程介的小学生 2019-08-12 21:56 采纳率: 20.5%
浏览 188

Toxophily, C语言怎么做的呢

Problem Description
The recreation center of WHU ACM Team has indoor billiards, Ping Pang, chess and bridge, toxophily, deluxe ballrooms KTV rooms, fishing, climbing, and so on.
We all like toxophily.

Bob is hooked on toxophily recently. Assume that Bob is at point (0,0) and he wants to shoot the fruits on a nearby tree. He can adjust the angle to fix the trajectory. Unfortunately, he always fails at that. Can you help him?

Now given the object's coordinates, please calculate the angle between the arrow and x-axis at Bob's point. Assume that g=9.8N/m.

Input
The input consists of several test cases. The first line of input consists of an integer T, indicating the number of test cases. Each test case is on a separated line, and it consists three floating point numbers: x, y, v. x and y indicate the coordinate of the fruit. v is the arrow's exit speed.
Technical Specification

  1. T ≤ 100.
  2. 0 ≤ x, y, v ≤ 10000.

Output
For each test case, output the smallest answer rounded to six fractional digits on a separated line.
Output "-1", if there's no possible answer.

Please use radian as unit.

Sample Input
3
0.222018 23.901887 121.909183
39.096669 110.210922 20.270030
138.355025 2028.716904 25.079551

Sample Output
1.561582
-1
-1

  • 写回答

0条回答 默认 最新

    报告相同问题?

    悬赏问题

    • ¥15 maple软件,用solve求反函数出现rootof,怎么办?
    • ¥50 汇编语言除法溢出问题
    • ¥65 C++实现删除N个数据列表共有的元素
    • ¥15 Visual Studio问题
    • ¥15 state显示变量是字符串形式,但是仍然红色,无法引用,并显示类型不匹配
    • ¥20 求一个html代码,有偿
    • ¥100 关于使用MATLAB中copularnd函数的问题
    • ¥20 在虚拟机的pycharm上
    • ¥15 jupyterthemes 设置完毕后没有效果
    • ¥15 matlab图像高斯低通滤波