source_code: import java.io.OutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.PrintWriter;
  import java.util.Arrays;
  import java.io.BufferedWriter;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.math.BigDecimal;
  import java.util.StringTokenizer;
  import java.io.Writer;
  import java.io.OutputStreamWriter;
  import java.io.BufferedReader;
  import java.io.InputStream;
  
  /**
   * Built using CHelper plug-in
   * Actual solution is at the top
   *
   * @author phantom11
   */
  public class Main {
      public static void main(String[] args) {
          InputStream inputStream = System.in;
          OutputStream outputStream = System.out;
          InputReader in = new InputReader(inputStream);
          OutputWriter out = new OutputWriter(outputStream);
          TaskC solver = new TaskC();
          solver.solve(1, in, out);
          out.close();
      }
  
      static class TaskC {
          public void solve(int testNumber, InputReader in, OutputWriter out) {
              int N = in.nextInt();
              int r = in.nextInt();
              int i, j;
              BigDecimal initial = new BigDecimal(10);
              initial = initial.pow(100);
              int x[] = new int[N];
              BigDecimal y[] = new BigDecimal[N];
              Arrays.fill(y, initial);
              for (i = 0; i < N; i++) {
                  x[i] = in.nextInt();
              }
              for (i = 0; i < N; i++) {
                  BigDecimal y2 = new BigDecimal(r);
                  for (j = 0; j < i; j++) {
                      if (Math.abs(x[i] - x[j]) <= 2 * r) {
                          double xDiff = x[i] - x[j];
                          xDiff *= xDiff;
                          xDiff = 4 * r * r - xDiff;
                          xDiff = Math.sqrt(xDiff);
                          BigDecimal yNew = new BigDecimal(xDiff);
                          yNew = yNew.add(y[j]);
                          if (yNew.compareTo(y2) > 0) {
                              y2 = yNew;
                          }
                      }
                  }
                  y[i] = y2;
              }
              for (i = 0; i < N; i++) {
                  out.print(y[i] + " ");
              }
          }
  
      }
  
      static class InputReader {
          BufferedReader in;
          StringTokenizer tokenizer = null;
  
          public InputReader(InputStream inputStream) {
              in = new BufferedReader(new InputStreamReader(inputStream));
          }
  
          public String next() {
              try {
                  while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                      tokenizer = new StringTokenizer(in.readLine());
                  }
                  return tokenizer.nextToken();
              } catch (IOException e) {
                  return null;
              }
          }
  
          public int nextInt() {
              return Integer.parseInt(next());
          }
  
      }
  
      static class OutputWriter {
          private final PrintWriter writer;
  
          public OutputWriter(OutputStream outputStream) {
              writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
          }
  
          public OutputWriter(Writer writer) {
              this.writer = new PrintWriter(writer);
          }
  
          public void print(Object... objects) {
              for (int i = 0; i < objects.length; i++) {
                  if (i != 0)
                      writer.print(' ');
                  writer.print(objects[i]);
              }
          }
  
          public void close() {
              writer.close();
          }
  
      }
  }
  
  