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  1. public class Flee {
  2.  
  3.     boolean check(int[] x, int[] y, double r)
  4.     {
  5.         int n = x.length;
  6.         for(int i = 0; i < n; i++)
  7.             if(x[i]*x[i] + y[i]*y[i] <= r*r)
  8.                 return true;
  9.         boolean linked[][] = new boolean[n][n];
  10.         for(int i = 0; i < n; i++)
  11.             for(int j = 0; j < n; j++)
  12.                 if((x[i]-x[j])*(x[i]-x[j]) + (y[i]-y[j])*(y[i]-y[j]) <= 4*r*r)
  13.                     linked[i][j] = true;
  14.         for(int start = 0; start < n; start++)
  15.         {
  16.             double[] maxVal = new double[n];
  17.             for(int i = 0; i < n; i++)
  18.                 maxVal[i] = -1000;
  19.             maxVal[start] = 0;
  20.             for(int iteration = 1; iteration <= n; iteration ++)
  21.             {
  22.                 for(int i = 0; i < n; i++)
  23.                     for(int j = 0; j < n; j++)
  24.                         if(linked[i][j])
  25.                         {
  26.                             double delta = Math.atan2(y[j], x[j]) - Math.atan2(y[i], x[i]);
  27.                             if(Math.abs(delta + Math.PI * 2) < Math.abs(delta))
  28.                                 delta = delta + Math.PI * 2;
  29.                             else if(Math.abs(delta - Math.PI*2) < Math.abs(delta))
  30.                                 delta = delta - Math.PI * 2;
  31.                             maxVal[j] = Math.max(maxVal[j], maxVal[i] + delta);
  32.                         }
  33.             }
  34.             if(maxVal[start] >= 2 * Math.PI - 1e-9)
  35.                 return true;
  36.         }
  37.         return false;
  38.     }
  39.  
  40.     public double maximalSafetyLevel(int[] x, int[] y)
  41.     {
  42.         double L = 0, R = 2000, M = 0;
  43.         for(int iteration = 1; iteration <= 100; iteration ++)
  44.         {
  45.             M = (L + R) / 2;
  46.             if(check(x, y, M))
  47.                 R = M;
  48.             else
  49.                 L = M;
  50.         }
  51.         return M;
  52.     }
  53. }
  54.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:1: error: class Flee is public, should be declared in a file named Flee.java
public class Flee {
       ^
1 error
stdout 
Standard output is empty
https://ideone.com/04H4H8
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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