例题: 51nod 1006
解析1:http://blog.csdn.net/yysdsyl/article/details/4226630/
解析2:http://blog.csdn.net/hrn1216/article/details/51534607
例题: 51nod 1006
解析1:http://blog.csdn.net/yysdsyl/article/details/4226630/
解析2:http://blog.csdn.net/hrn1216/article/details/51534607