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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
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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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

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.
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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