# https://theweeklychallenge.org/blog/perl-weekly-challenge-288/#TASK2
class Cell {
has $.row;
has $.col;
has $.symbol;
multi method new($row, $col, $symbol) { self.bless(:$row, :$col, :$symbol) }
multi method WHICH(Cell:D:) { "Cell|{$!row},{$!col},{$!symbol}" }
}
my @M = $*IN.lines.map({ .comb.Array });
my @blocks;
for ^+@M X ^+@M[0] -> (\row, \col) {
my \symbol = @M[row;col];
@blocks.unshift(Cell.new(row, col, symbol).SetHash);
my $i = 1;
while $i < +@blocks {
if Cell.new(row-1,col,symbol) | Cell.new(row+1,col,symbol) |
Cell.new(row,col-1,symbol) | Cell.new(row,col+1,symbol) (elem) @blocks[$i] {
@blocks[0] (|)= @blocks[$i];
@blocks.splice($i, 1);
} else {
++$i;
}
}
}
put @blocks».elems.max;
