source_code: import java.io.OutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintWriter;
  import java.util.InputMismatchException;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.io.InputStream;
  
  /**
   * Built using CHelper plug-in
   * Actual solution is at the top
   *
   * @author Pradyumn
   */
  public class Main {
      public static void main(String[] args) {
          InputStream inputStream = System.in;
          OutputStream outputStream = System.out;
          FastReader in = new FastReader(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, FastReader in, PrintWriter out) {
              Debug debug = new Debug(out);
              int n = in.nextInt();
              TaskC.Circle[] c = new TaskC.Circle[n];
              double rr = in.nextInt();
              for (int i = 0; i < n; ++i) {
                  c[i] = new TaskC.Circle();
                  c[i].x = in.nextInt();
              }
              ArrayList<TaskC.Circle> done = new ArrayList<>();
              for (int i = 0; i < n; ++i) {
                  TaskC.Circle cur = c[i];
                  double ans = Double.MIN_VALUE;
                  for (int j = 0; j < done.size(); ++j) {
                      TaskC.Circle dd = done.get(j);
                      if (Double.compare(2 * rr, Math.abs(dd.x - cur.x)) < 0) continue;
                      double temp = Math.sqrt(4 * rr * rr - (cur.x - dd.x) * (cur.x - dd.x)) + dd.y;
                      ans = Math.max(ans, temp);
                  }
                  if (ans == Double.MIN_VALUE)
                      ans = rr;
                  cur.y = ans;
                  done.add(cur);
              }
              for (TaskC.Circle cc : done) {
                  out.printf("%.12f ", cc.y);
              }
          }
  
          static class Circle implements Comparable<TaskC.Circle> {
              double x;
              double y;
  
  
              public boolean equals(Object o) {
                  if (o == null) return false;
                  if (o == this) return true;
                  if (o.getClass() != this.getClass()) return false;
  
                  TaskC.Circle c = (TaskC.Circle) o;
                  return Double.compare(x, c.x) == 0 && Double.compare(y, c.y) == 0;
              }
  
  
              public int compareTo(TaskC.Circle o) {
                  if (Double.compare(o.x, x) != 0) {
                      return Double.compare(x, o.x);
                  }
                  return Double.compare(y, o.y);
              }
  
          }
  
      }
  
      static class Debug {
          PrintWriter out;
          boolean oj;
          long timeBegin;
          Runtime runtime;
  
          public Debug(PrintWriter out) {
              oj = System.getProperty("ONLINE_JUDGE") != null;
              this.out = out;
              this.timeBegin = System.currentTimeMillis();
              this.runtime = Runtime.getRuntime();
          }
  
      }
  
      static class FastReader {
          private InputStream stream;
          private byte[] buf = new byte[8192];
          private int curChar;
          private int pnumChars;
  
          public FastReader(InputStream stream) {
              this.stream = stream;
          }
  
          private int pread() {
              if (pnumChars == -1) {
                  throw new InputMismatchException();
              }
              if (curChar >= pnumChars) {
                  curChar = 0;
                  try {
                      pnumChars = stream.read(buf);
                  } catch (IOException e) {
                      throw new InputMismatchException();
                  }
                  if (pnumChars <= 0) {
                      return -1;
                  }
              }
              return buf[curChar++];
          }
  
          public int nextInt() {
              int c = pread();
              while (isSpaceChar(c))
                  c = pread();
              int sgn = 1;
              if (c == '-') {
                  sgn = -1;
                  c = pread();
              }
              int res = 0;
              do {
                  if (c == ',') {
                      c = pread();
                  }
                  if (c < '0' || c > '9') {
                      throw new InputMismatchException();
                  }
                  res *= 10;
                  res += c - '0';
                  c = pread();
              } while (!isSpaceChar(c));
              return res * sgn;
          }
  
          private boolean isSpaceChar(int c) {
              return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
          }
  
      }
  }
  
  