Solution Kattis · Santa Klas

Source 

https://open.kattis.com/problems/santaklas

Editorial:

- Satan's train can only hit the ground when the angle v > 180. To calculate the time to hit the ground, we apply the geometry formula of junior high school: 

with h is the number of whole seconds that the ACM have to safely wake Santa Klas up

        b, angle α: Santa Klas’ current altitude and his current angle in degrees from the horizon

Code:

#include<bits/stdc++.h>

#define pi atan(1)*4

using namespace std;

int main(){

   

    int h, a;

    cin >> h >> a;

    cout << (a <= 180 ? "safe" : to_string( (int)floor(h/cos(abs(270-a)*pi/180)) ));

                       

}