source_code: import java.io.OutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintWriter;
  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
   */
  public class Main {
      public static void main(String[] args) {
          InputStream inputStream = System.in;
          OutputStream outputStream = System.out;
          Scanner in = new Scanner(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, Scanner in, PrintWriter out) {
              int n = in.nextInt();
              int r = in.nextInt();
              int[] xs = new int[n];
              for (int i = 0; i < n; i++) xs[i] = in.nextInt();
              double[] ys = new double[n];
              for (int i = 0; i < n; i++) {
                  int x = xs[i];
                  double y = r;
                  for (int j = 0; j < i; j++) {
                      y = Math.max(y, calc(xs[j], ys[j], x, r));
                  }
                  ys[i] = y;
              }
              for (int i = 0; i < n; i++) {
                  out.printf("%.10f ", ys[i]);
              }
              out.println();
          }
  
          private double calc(int x, double y, int x1, int r) {
              int dx = Math.abs(x - x1);
              if (dx > 2 * r) return 0;
              double dy = Math.sqrt(4 * r * r - dx * dx);
              return y + dy;
          }
  
      }
  
      static class Scanner {
          BufferedReader br;
          StringTokenizer st;
  
          public Scanner(InputStream in) {
              br = new BufferedReader(new InputStreamReader(in), 32768);
          }
  
          public String nextLine() {
              try {
                  return br.readLine();
              } catch (IOException e) {
                  return null;
              }
          }
  
          public boolean hasNext() {
              while (st == null || !st.hasMoreTokens()) {
                  String s = nextLine();
                  if (s == null)
                      return false;
                  st = new StringTokenizer(s);
              }
              return true;
          }
  
          public String next() {
              hasNext();
              return st.nextToken();
          }
  
          public int nextInt() {
              return Integer.parseInt(next());
          }
  
      }
  }
  
  