source_code: 
  public class Main {
  
  	private static void solve() {
  		int n = ni();
  		double r = ni();
  
  		double[][] p = new double[n][2];
  		double EPS = 0.0000000000001;
  
  		for (int i = 0; i < n; i ++) {
  			double x = ni();
  			double y = r;
  			for (int j = 0; j < i; j ++) {
  				double dx = Math.abs(p[j][0] - x);
  				if (dx <= r * 2 + EPS) {
  					double dy = Math.sqrt(4.0 * r * r - dx * dx);
  					y = Math.max(y, p[j][1] + dy);
  				}
  			}
  			out.printf("%.12f ", y);
  			p[i][0] = x;
  			p[i][1] = y;
  		}
  		out.println();
  	}
  
  	public static void main(String[] args) {
  		new Thread(null, new Runnable() {
  			@Override
  			public void run() {
  				long start = System.currentTimeMillis();
  				String debug = args.length > 0 ? args[0] : null;
  				if (debug != null) {
  					try {
  						is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug));
  					} catch (Exception e) {
  						throw new RuntimeException(e);
  					}
  				}
  				reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768);
  				solve();
  				out.flush();
  				tr((System.currentTimeMillis() - start) + "ms");
  			}
  		}, "", 64000000).start();
  	}
  
  	private static java.io.InputStream is = System.in;
  	private static java.io.PrintWriter out = new java.io.PrintWriter(System.out);
  	private static java.util.StringTokenizer tokenizer = null;
  	private static java.io.BufferedReader reader;
  
  	public static String next() {
  		while (tokenizer == null || !tokenizer.hasMoreTokens()) {
  			try {
  				tokenizer = new java.util.StringTokenizer(reader.readLine());
  			} catch (Exception e) {
  				throw new RuntimeException(e);
  			}
  		}
  		return tokenizer.nextToken();
  	}
  
  	private static double nd() {
  		return Double.parseDouble(next());
  	}
  
  	private static long nl() {
  		return Long.parseLong(next());
  	}
  
  	private static int[] na(int n) {
  		int[] a = new int[n];
  		for (int i = 0; i < n; i++)
  			a[i] = ni();
  		return a;
  	}
  
  	private static char[] ns() {
  		return next().toCharArray();
  	}
  
  	private static long[] nal(int n) {
  		long[] a = new long[n];
  		for (int i = 0; i < n; i++)
  			a[i] = nl();
  		return a;
  	}
  
  	private static int[][] ntable(int n, int m) {
  		int[][] table = new int[n][m];
  		for (int i = 0; i < n; i++) {
  			for (int j = 0; j < m; j++) {
  				table[i][j] = ni();
  			}
  		}
  		return table;
  	}
  
  	private static int[][] nlist(int n, int m) {
  		int[][] table = new int[m][n];
  		for (int i = 0; i < n; i++) {
  			for (int j = 0; j < m; j++) {
  				table[j][i] = ni();
  			}
  		}
  		return table;
  	}
  
  	private static int ni() {
  		return Integer.parseInt(next());
  	}
  
  	private static void tr(Object... o) {
  		if (is != System.in)
  			System.out.println(java.util.Arrays.deepToString(o));
  	}
  }
  