Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'. A region is captured by flipping all 'O's into 'X's in that surrounded region.
Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'. A region is captured by flipping all 'O's into 'X's in that surrounded region.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Input-1.txt
6
X X X X X O
X O X O O X
X X O O O X
X X X O X X
X O X X O O
X X X X X X
input-2.txt
8
X X X X X O O X
X O X O O X O O
X X O O O X X X
X X X O X X O O
X O X X O O O O
X X O X X X X O
O X O O O O X X
X X X X X X X X
Transcribed Image Text:Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'.
A region is captured by flipping all 'O's into 'X's in that surrounded region.
For example, for the following board,
X X X X
X O O X
XXOX
хохх
After capturing all regions, the board becomes
X X X X
X X XX
X X X X
хохх
The algorithm should take an input file, named input.txt, and output the resulting board in
the console.
Sample input.txt:
XXXX хо
хохо ох
X X 0 0 O X
X X X O X X
хоххо о
X X X X X X
The first line is a number indicating the size of the board; in the above example, 6 means the
board is 6 x 6.
Output for in console:
X X X X XO
ХXXXX х
X X X X XX
XXXX хх
XXXX ОО
XX X X X X
To clarify 'being surrounded', consider the following example:
1 x 3
хох
7 x 9
The center O IS surrounded by Xs regardless of the symbols at positions 1, 3, 7, and 9. That being
said, we only need to check the neighbors above, below, to the left, and to the right, in order to
determine whether a region is surrounded or not. Elements on the diagonal should not be taken
into account.
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