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static public String decodeRubust(String str) {
		if (str == null || str.length() < 1)
			return null;
		int num = Integer.valueOf(str.charAt(0) + "");
		int step = (str.length() - 1) / num;
		int helpStep = step;
		String[] matrix = new String[num];
		System.out.println(str.length() - 1);

		int duo = (str.length() - 1) % num;

		for (int i = 0,j = 1; i < matrix.length; i++,j = j + helpStep) {
			if (i < duo)
				helpStep = step + 1;
			else
				helpStep = step;

			matrix[i] = str.substring(j,j + helpStep);
			System.out.println(matrix[i]);
		}
		// print(matrix);

		return makeSense(matrix);

	}

private static String makeSense(String[] matrix) {
		StringBuffer sb = new StringBuffer();
		for (int j = 0; j < matrix[0].length(); j++) {
			for (int i = 0; i < matrix.length; i++) {
				if (matrix[i].length() - 1 >= j)
					sb.append(matrix[i].charAt(j));
			}
		}

		System.out.println(sb.toString());

		String tmp = new String();
		try {
			tmp = URLDecoder.decode(sb.toString(),"UTF-8");
			tmp = tmp.replaceAll("\\^","0");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
			tmp = null;
		}

		if (tmp.subSequence(0,7).equals("http://") && tmp.substring(tmp.length()-6).equals("0-null"))
			return tmp;
		else
			return null;
	}

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