public String longestCommonPrefix(String[] strs) {
      StringBuilder sBuilder=new StringBuilder();
		if(strs==null||strs.length==0)return "";
		String team=strs[0];
		for(int i=0;i<strs.length;i++)
		{
			if(strs[i].length()<team.length())
			{
				team=strs[i];
			}
		}
		int i=0;
		for(;i<team.length();i++)
		{
			for(int j=0;j<strs.length;j++)
			{
				//System.out.println(strs[j].charAt(i)+" "+team.charAt(i));
				if(strs[j].charAt(i)!=team.charAt(i))
				{
					 return sBuilder.toString();
					
				}
			}
			sBuilder.append(team.charAt(i));
		}
		return sBuilder.toString();		
    }