Coding Games and Programming Challenges to Code Better
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Created by @hhgit,validated by @DeanTheMachine,@Delicious31415 and @ManuelJ.
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Disappointed to see that this puzzle does not cover cases like this:
5 3
O..O.
..O..
XXXXX
.....
....O
(Besides, this is my preferred format - avoid using spaces at EOL in I/O data.)