2018 NAIPC Practice Contest 01

#### Start

2018-01-13 18:00 UTC

## 2018 NAIPC Practice Contest 01

#### End

2018-01-13 23:00 UTC
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# Problem GSki Jumping

Ski jumping is one of the most popular winter sport competitions. In the chase of records, ski jumping hills become larger and larger. To ensure the safety of the competitors, landing speed and angle must not exceed critical margins defined by the FIS. Today, it’s your task to assess these values for a newly constructed ski jumping arena shown in the figure.

Instead of doing measurements in the field, you can use a little math to solve your problem, since the hill has the following shape:

$$h(l) = \begin{cases} H & \; \, l < 0 \\ H\cdot \left( 1 - 2 \cdot \left(\frac{l}{L}\right)^2 \right) & \; 0 \le l < \frac{L}{2} \\ 2H\cdot \left( \frac{l}{L} - 1 \right)^2 & \frac{L}{2} \le l < L \\ 0 & \, L \le l \end{cases} \,$$

where $l$ is the position on the x-axis with its origin in the beginning of the hill. $H$ is the height and $L$ is the width of the hill; $j$ is the maximum starting height of the ski-jump and $p$ is the height difference between the end of the (ski-jump) approach and the top of the hill. Assuming that friction plays no important role and since the critical margins are defined for a flight without any influence of wind, you may utilize the following flight curve:

$$f(l) = -\frac{g}{2}\cdot \left(\frac{l}{v_0}\right)^2 + H + p \qquad \left(\; 0 \le l \; \wedge \; f(l) \ge h(l) \; \right) \,$$

where $v_0$ is the speed gained in the approach. You can obtain this value from the law of energy conservation. Potential and kinetic energy are defined as follows:

$$E_\mathrm {kin} = \frac{1}{2} \times \mathrm{mass} \times \mathrm{speed}^2 \, ,\qquad E_\mathrm {pot} = \mathrm{mass} \times g \times \mathrm{height} \, .$$

In all equations, $g$ is the gravitational constant ($g\approx 9.81\, \mathrm{m\, s}^{-2}$).

Hints:

The inner product of two vectors $\vec{a}$ and $\vec{b}$ is defined as:

$$\vec{a}\cdot \vec{b} = |\vec{a}|\cdot |{\vec{b}}|\cdot \cos \measuredangle (\vec{a},\vec{b})$$

## Input

Input starts with the number of test cases $t$ on a single line ($0 < t < 160\, 000$).

Every test case consists of a single line containing four positive integers $j$, $p$, $H$, and $L$ as defined in the problem statement ($0 < j,p,H,L \le 500$). The unit of all values is meter.

## Output

For every test case, print one line containing

• the landing position $l$ on the x-axis,

• the landing speed $|v_ l|$ of the jumper (in meters per second), and

• the speed-angle $\alpha$ (in degree) with respect to the hill (see the figure).

The values must be separated by a single blank. An absolute or relative error of $10^{-4}$ is tolerated.

Sample Input 1 Sample Output 1
3
50 5 10 100
50 5 30 100
50 5 50 100

40.82482905 33.83045965 12.93315449
81.04978134 40.31656580 26.21334827
104.8808848 45.38832449 46.36470132