source_code: import java.io.OutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintWriter;
  import java.io.PrintStream;
  import java.util.StringTokenizer;
  import java.io.IOException;
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.io.InputStream;
  
  /**
   * Built using CHelper plug-in
   * Actual solution is at the top
   *
   * @author Wolfgang Beyer
   */
  public class Main {
      public static void main(String[] args) {
          InputStream inputStream = System.in;
          OutputStream outputStream = System.out;
          InputReader in = new InputReader(inputStream);
          PrintWriter out = new PrintWriter(outputStream);
          TaskC solver = new TaskC();
          solver.solve(1, in, out);
          out.close();
      }
  
      static class TaskC {
          public void solve(int testNumber, InputReader in, PrintWriter out) {
              int n = in.nextInt();
              int r = in.nextInt();
              int[] x = in.readIntArray(n);
              double[] y = new double[n];
              for (int i = 0; i < n; i++) {
                  y[i] = r;
                  for (int j = 0; j < i; j++) {
                      double d = Math.abs(x[j] - x[i]);
                      if (d <= 2 * r) {
                          double yy = Math.sqrt(4.0 * r * r - d * d);
                          y[i] = Math.max(y[i], y[j] + yy);
                      }
                  }
              }
              for (int i = 0; i < n; i++) {
                  out.print(y[i] + " ");
              }
          }
  
      }
  
      static class InputReader {
          private static BufferedReader in;
          private static StringTokenizer tok;
  
          public InputReader(InputStream in) {
              this.in = new BufferedReader(new InputStreamReader(in));
          }
  
          public int nextInt() {
              return Integer.parseInt(next());
          }
  
          public int[] readIntArray(int n) {
              int[] ar = new int[n];
              for (int i = 0; i < n; i++) {
                  ar[i] = nextInt();
              }
              return ar;
          }
  
          public String next() {
              try {
                  while (tok == null || !tok.hasMoreTokens()) {
                      tok = new StringTokenizer(in.readLine());
                      //tok = new StringTokenizer(in.readLine(), ", \t\n\r\f"); //adds commas as delimeter
                  }
              } catch (IOException ex) {
                  System.err.println("An IOException was caught :" + ex.getMessage());
              }
              return tok.nextToken();
          }
  
      }
  }
  
  