题目如下：

Maze Exploration

A maze of rectangular rooms is represented on a twodimensional grid as illustrated in figure 1a. Each point of thegrid is represented by a character. The points of room walls aremarked by the same character which can be any printable characterdifferent than `*‘, `_‘ and space. In figure 1 this character is`X‘. All the other points of the grid are markedby spaces.

               XXXXXXXXXXXXXXXXXXXXX             XXXXXXXXXXXXXXXXXXXXX
               X   X   X   X   X   X             X###X###X###X   X   X
               X           X   X   X             X###########X   X   X
               X   X   X   X   X   X             X###X###X###X   X   X
               XXXXXX XXX XXXXXXXXXX             XXXXXX#XXX#XXXXXXXXXX
               X   X   X   X   X   X             X   X###X###X###X###X
               X   X     *         X             X   X###############X
               X   X   X   X   X   X             X   X###X###X###X###X
               XXXXXXXXXXXXXXXXXXXXX             XXXXXXXXXXXXXXXXXXXXX

All rooms of the maze are equal sized with all walls 3points wide and 1 point thick as illustrated in figure 2. Inaddition, a wall is shared on its full length by the separatedrooms. The rooms can communicate through doors, which arepositioned in the middle of walls. There are no outdoor doors.

                     door
                       |
                     XX XX
                     X . X   measured from within the room
               door - ...--  walls are 3 points wide
                     X . X__
                     XXXXX  |
                       |___  walls are one point thick

Your problem is to paint all rooms of a maze which can bevisited starting from a given room, called the `start room‘ whichis marked by a star (`*‘) positioned in the middle of theroom. A room can be visited from another room if there is a dooron the wall which separates the rooms. By convention, a room ispainted if its entire surface, including the doors, is markedby the character `#‘ as shown in figure 1b.

Input 

1.

The first line contains a positive integer which shows thenumber of mazes to be painted.

2.

The rest of the file contains the mazes.

The lines of the input file can be of different length. Thetext which represents a maze is terminated by a separation linefull of underscores (`_‘). There are at most 30 lines andat most 80 characters in a line for each maze

The program reads the mazes from the input file, paints themand writes the painted mazes on the standard output.

Output 

Sample Input 

2
XXXXXXXXX
X   X   X
X *     X
X   X   X
XXXXXXXXX
X   X
X   X
X   X
XXXXX
_____
XXXXX
X   X
X * X
X   X
XXXXX
_____

Sample Output 

XXXXXXXXX
X###X###X
X#######X
X###X###X
XXXXXXXXX
X   X
X   X
X   X
XXXXX
_____
XXXXX
X###X
X###X
X###X
XXXXX
_____

AC的代码如下：

直接模拟版

DFS版