gt:             vals[i] = Double.parseDouble(fields[i]);
context: 
  import java.util.Scanner;
  import java.util.regex.Pattern;
  public final class StdIn {
  	 // it doesn't make sense to instantiate this class
      private StdIn() {}
  
      private static Scanner scanner;
   
      /*** begin: section (1 of 2) of code duplicated from In to StdIn */
      
      // assume Unicode UTF-8 encoding
      private static final String charsetName = "UTF-8";
  
      // assume language = English, country = US for consistency with System.out.
      private static final java.util.Locale usLocale = 
          new java.util.Locale("en", "US");
  
      // the default token separator; we maintain the invariant that this value 
      // is held by the scanner's delimiter between calls
      private static final Pattern WHITESPACE_PATTERN
          = Pattern.compile("\\p{javaWhitespace}+");
  
      // makes whitespace characters significant 
      private static final Pattern EMPTY_PATTERN
          = Pattern.compile("");
  
      // used to read the entire input. source:
      // http://weblogs.java.net/blog/pat/archive/2004/10/stupid_scanner_1.html
      private static final Pattern EVERYTHING_PATTERN
          = Pattern.compile("\\A");
  
      /*** end: section (1 of 2) of code duplicated from In to StdIn */
  
      /*** begin: section (2 of 2) of code duplicated from In to StdIn,
        *  with all methods changed from "public" to "public static" ***/
  
     /**
       * Is the input empty (except possibly for whitespace)? Use this
       * to know whether the next call to {@link #readString()}, 
       * {@link #readDouble()}, etc will succeed.
       */
      public static boolean isEmpty() {
          return !scanner.hasNext();
      }
  
     /**
       * Does the input have a next line? Use this to know whether the
       * next call to {@link #readLine()} will succeed. <p> Functionally
       * equivalent to {@link #hasNextChar()}.
       */
      public static boolean hasNextLine() {
          return scanner.hasNextLine();
      }
  
      /**
       * Is the input empty (including whitespace)? Use this to know 
       * whether the next call to {@link #readChar()} will succeed. <p> Functionally
       * equivalent to {@link #hasNextLine()}.
       */
      public static boolean hasNextChar() {
          scanner.useDelimiter(EMPTY_PATTERN);
          boolean result = scanner.hasNext();
          scanner.useDelimiter(WHITESPACE_PATTERN);
          return result;
      }
  
  
     /**
       * Read and return the next line.
       */
      public static String readLine() {
          String line;
          try                 { line = scanner.nextLine(); }
          catch (Exception e) { line = null;               }
          return line;
      }
  
      /**
       * Read and return the next character.
       */
      public static char readChar() {
          scanner.useDelimiter(EMPTY_PATTERN);
          String ch = scanner.next();
          assert (ch.length() == 1) : "Internal (Std)In.readChar() error!"
              + " Please contact the authors.";
          scanner.useDelimiter(WHITESPACE_PATTERN);
          return ch.charAt(0);
      }  
  
  
     /**
       * Read and return the remainder of the input as a string.
       */
      public static String readAll() {
          if (!scanner.hasNextLine())
              return "";
  
          String result = scanner.useDelimiter(EVERYTHING_PATTERN).next();
          // not that important to reset delimeter, since now scanner is empty
          scanner.useDelimiter(WHITESPACE_PATTERN); // but let's do it anyway
          return result;
      }
  
  
     /**
       * Read and return the next string.
       */
      public static String readString() {
          return scanner.next();
      }
  
     /**
       * Read and return the next int.
       */
      public static int readInt() {
          return scanner.nextInt();
      }
  
     /**
       * Read and return the next double.
       */
      public static double readDouble() {
          return scanner.nextDouble();
      }
  
     /**
       * Read and return the next float.
       */
      public static float readFloat() {
          return scanner.nextFloat();
      }
  
     /**
       * Read and return the next long.
       */
      public static long readLong() {
          return scanner.nextLong();
      }
  
     /**
       * Read and return the next short.
       */
      public static short readShort() {
          return scanner.nextShort();
      }
  
     /**
       * Read and return the next byte.
       */
      public static byte readByte() {
          return scanner.nextByte();
      }
  
      /**
       * Read and return the next boolean, allowing case-insensitive
       * "true" or "1" for true, and "false" or "0" for false.
       */
      public static boolean readBoolean() {
          String s = readString();
          if (s.equalsIgnoreCase("true"))  return true;
          if (s.equalsIgnoreCase("false")) return false;
          if (s.equals("1"))               return true;
          if (s.equals("0"))               return false;
          throw new java.util.InputMismatchException();
      }
  
      /**
       * Read all strings until the end of input is reached, and return them.
       */
      public static String[] readAllStrings() {
          // we could use readAll.trim().split(), but that's not consistent
          // since trim() uses characters 0x00..0x20 as whitespace
          String[] tokens = WHITESPACE_PATTERN.split(readAll());
          if (tokens.length == 0 || tokens[0].length() > 0)
              return tokens;
          String[] decapitokens = new String[tokens.length-1];
          for (int i=0; i < tokens.length-1; i++)
              decapitokens[i] = tokens[i+1];
          return decapitokens;
      }
  
      /**
       * Read all ints until the end of input is reached, and return them.
       */
      public static int[] readAllInts() {
          String[] fields = readAllStrings();
          int[] vals = new int[fields.length];
          for (int i = 0; i < fields.length; i++)
              vals[i] = Integer.parseInt(fields[i]);
          return vals;
      }
  
      /**
       * Read all doubles until the end of input is reached, and return them.
       */
      public static double[] readAllDoubles() {
          String[] fields = readAllStrings();
          double[] vals = new double[fields.length];
          for (int i = 0; i < fields.length; i++)
  