<?php class DBDA { public $host = "localhost"; public $uid = "root"; public $pwd = "20982239"; //执行sql语句,返回相应的结果函数 //$sql是要执行的sql语句 //$type是sql语句的类型,0代表增删改,1代表查询 //$db代表要操作的数据库 public function Query($sql,$type=1,$db="…
Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent cell, where "adjacent" cells are those horizontally or vertically neighboring. The same letter cell may not be us…