source_code: import java.io.OutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintWriter;
  import java.util.Arrays;
  import java.util.InputMismatchException;
  import java.io.IOException;
  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;
          FastScanner in = new FastScanner(inputStream);
          PrintWriter out = new PrintWriter(outputStream);
          C908 solver = new C908();
          solver.solve(1, in, out);
          out.close();
      }
  
      static class C908 {
          int N;
          int R;
          int[] x;
          double[] ans;
  
          public void solve(int testNumber, FastScanner s, PrintWriter out) {
  
              N = s.nextInt();
              R = s.nextInt();
              x = s.nextIntArray(N);
  
              ans = new double[N];
              Arrays.fill(ans, R);
  
              for (int i = 0; i < N; i++) {
                  // placing circle i
                  for (int j = 0; j < i; j++) {
                      // testing collision with placed circles
                      if (Math.abs(x[i] - x[j]) <= 2 * R) {
                          // they will collide
                          // compute the increase in y that will be had
                          double dy = Math.sqrt(Math.pow(2 * R, 2) - Math.pow(x[i] - x[j], 2));
                          ans[i] = Math.max(ans[i], ans[j] + dy);
                      }
                  }
              }
  
              for (double d : ans)
                  out.print(d + " ");
              out.println();
  
          }
  
      }
  
      static class FastScanner {
          private InputStream stream;
          private byte[] buf = new byte[1024];
          private int curChar;
          private int numChars;
  
          public FastScanner(InputStream stream) {
              this.stream = stream;
          }
  
          int read() {
              if (numChars == -1)
                  throw new InputMismatchException();
              if (curChar >= numChars) {
                  curChar = 0;
                  try {
                      numChars = stream.read(buf);
                  } catch (IOException e) {
                      throw new InputMismatchException();
                  }
                  if (numChars <= 0)
                      return -1;
              }
              return buf[curChar++];
          }
  
          boolean isSpaceChar(int c) {
              return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
          }
  
          public int nextInt() {
              return Integer.parseInt(next());
          }
  
          public String next() {
              int c = read();
              while (isSpaceChar(c))
                  c = read();
              StringBuilder res = new StringBuilder();
              do {
                  res.appendCodePoint(c);
                  c = read();
              } while (!isSpaceChar(c));
              return res.toString();
          }
  
          public int[] nextIntArray(int N) {
              int[] ret = new int[N];
              for (int i = 0; i < N; i++)
                  ret[i] = this.nextInt();
              return ret;
          }
  
      }
  }
  
  