Flood Fill
In computer graphics, an uncompressed raster image is presented as a matrix of numbers. Each entry of the matrix represents the color of a pixel. A flood fill algorithm takes a coordinate r, c
and a replacement color, and replaces all pixels connected to r, c
that have the same color (i.e., the pixels connected to the given coordinate with same color and all the other pixels connected to the those pixels of the same color) with the replacement color. (e.g. MS-Paint's paint bucket tool).
Input
r
: rowc
: columnreplacement
: replacement colorimage
: an 2D array of integers representing the image
Output
the replaced image
Examples
Example 1:
Input:
1r = 2 2c = 2 3replacement = 9 4arr = [[0,1,3,4,1],[3,8,8,3,3],[6,7,8,8,3],[12,2,8,9,1],[12,3,1,3,2]]
Output: [[0,1,3,4,1],[3,9,9,3,3],[6,7,9,9,3],[12,2,9,9,1],[12,3,1,3,2]]
Explanation:
From
10 1 3 4 1 23 8 8 3 3 36 7 8 8 3 412 2 8 9 1 512 3 1 3 2
to
10 1 3 4 1 23 9 9 3 3 36 7 9 9 3 412 2 9 9 1 512 3 1 3 2