CSE 423 : Computer Graphics
Assignment 6
Floodfill
Input: standard input
Output: Standard Output
Adapted from problem #785, Valladolid Online Judge.
http://acm.uva.es/p/v7/785.html
A contour is represented on a two dimensional grid as illustrated in the sample below.
The contours are made of ‘X’. All the other points of the grid are represented by ‘.’
(To indicate void space) and marking characters.
A grid zone is defined as the set of points enclosed within a closed contour such that
any two zone points can be connected by a path which does not cross any contour and
which has segments running vertically or horizontally. A zone is marked if it contains
identical characters, called marking characters, different than void (‘.’) and the
character used to draw the grid contours (‘X’). No zone can contain different marking
characters. However, observe that while all the contours are drawn with the same
character, the markings of different zones can be different. A zone is unmarked if it
contains only voids. Any grid zone can be either marked or unmarked. Note that there
is also an ‘outside zone’.
Write a program to fill all the marked zones. A marked zone is filled with its marking
character, as shown in the samples below.
Input
There will be only one grid as input as follows.
On the first line, there will be two integers, n (number of lines in the grid) and m
(number of cells on each line). 0 < n <=100, 0 < m <= 100. Then n lines will follow.
Each line will contain exactly m characters.
Output
Print the painted grid. Each grid is output in the same format as it is read from the
input.
Sample Input 1
Sample Output 1
5 22
..XXXXXXXXXXXXXXXXXXXX
..X......X...........X
..X.#.#..XXXXXXXX./..X
..X.............X....X
..XXXXXXXXXXXXXXXXXXXX
..XXXXXXXXXXXXXXXXXXXX
..X######X///////////X
..X######XXXXXXXX////X
..X#############X////X
..XXXXXXXXXXXXXXXXXXXX
Sample Input 2
Sample Output 2
9 28
...XXXXXXXXXXXX.......XXXXXX
..X.......#...XXX..XXX...X.X
..X..XX.........X..X.....X.X
.X..X..X..XXXXXXX..XXXXXXX..
.X...XX...X.................
..X.......X..XXXX..XXXXXXXX.
...XX.....XXXX..X..X../...X.
....X...........X..X..../.X.
....XXXXXXXXXXXXX..XXXXXXXX.
...XXXXXXXXXXXX.......XXXXXX
..X###########XXX..XXX...X.X
..X##XX#########X..X.....X.X
.X##X..X##XXXXXXX..XXXXXXX..
.X###XX###X.................
..X#######X..XXXX..XXXXXXXX.
...XX#####XXXX##X..X//////X.
....X###########X..X//////X.
....XXXXXXXXXXXXX..XXXXXXXX.
Sample Input 3
Sample Output 3
11 16
................
................
....XXXX........
...X/...X.......
...X....XXXX....
...X.../...X....
...X....XXXX....
XXXX....X.....#.
....XXXX........
..-.....X.......
.........X......
################
################
####XXXX########
###X////X#######
###X////XXXX####
###X///////X####
###X////XXXX####
XXXX////X#######
----XXXX########
--------X#######
---------X######