Word Break

	/**
	 * Given a string s and a dictionary of words dict, determine if s can
be
	 * segmented into a space-separated sequence of one or more dictionary
	 * words.
	 * 
	 * For example, given s = "leetcode", dict = ["leet", "code"].
	 * 
	 * Return true because "leetcode" can be segmented as "leet code".
	 * 
	 * */