source_code: 
  import java.io.*;
  import java.util.StringTokenizer;
  
  public class NewYearCurling908C {
      public static void main(String[] args) throws IOException {
          FastScanner in = new FastScanner();
          int n = in.nextInt();
          
          double r = (double) in.nextInt();
          double[] answers = new double[n];
          double[] xCoords = new double[n];
          for (int i = 0; i < n; i++) xCoords[i] = (double) in.nextInt();
          
          answers[0] = r;
          for (int i = 1; i < n; i++) {
              double bound = r;
              for (int j = 0; j < i; j++) {
                  double xDif = xCoords[i] - xCoords[j];
                  double y = answers[j];
                  double yNew = y + Math.sqrt(4 * r * r - xDif * xDif);
                  if (yNew > bound) bound = yNew;
              }
              answers[i] = bound;
          }
          for (int i = 0; i < n; i++) System.out.print(answers[i] + " ");
          System.out.println();
      }
  
      public static class FastScanner {
          BufferedReader br;
          StringTokenizer st;
  
          public FastScanner(String s) {
              try {
                  br = new BufferedReader(new FileReader(s));
              } catch (FileNotFoundException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
          }
  
          public FastScanner() {
              br = new BufferedReader(new InputStreamReader(System.in));
          }
  
          String nextToken() {
              while (st == null || !st.hasMoreElements()) {
                  try {
                      st = new StringTokenizer(br.readLine());
                  } catch (IOException e) {
                      // TODO Auto-generated catch block
                      e.printStackTrace();
                  }
              }
              return st.nextToken();
          }
  
          String nextLine() {
              st = null;
              try {
                  return br.readLine();
              } catch (IOException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
              return null;
          }
  
          int nextInt() {
              return Integer.parseInt(nextToken());
          }
  
          long nextLong() {
              return Long.parseLong(nextToken());
          }
  
          double nextDouble() {
              return Double.parseDouble(nextToken());
          }
      }
  }
  