你玩儿过扫雷游戏吧？有个操作系统中带了这个小游戏，那个系统叫什么来着？;-)在游戏中要想过关，就必须要在一个 NxM 的区域上找出所有的地雷。游戏过程中，计算机会在地图上显示一些数字从而帮助你确定哪里有地雷。例如，在下面这个有两颗地雷的 4x4 的地图（*表示地雷）：(Have you ever played Minesweeper games? There's an operating system with this little game. What's the name of that system? - - in order to pass the game, you have to find all the mines in a NxM area. During the game, the computer will display some numbers on the map to help you determine where there is a mine. For example, here's a map of 4x4 with two mines (* denotes landmines):)