Dominoes: Difference between revisions
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→{{header|Perl}}: rearrange
SqrtNegInf (talk | contribs) (→{{header|Perl}}: eliminate use of globals, no 'eval', any size grid, added extra credit) |
SqrtNegInf (talk | contribs) m (→{{header|Perl}}: rearrange) |
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{{libheader|ntheory}}
<syntaxhighlight lang="perl">use v5.36;
sub find ($rows, $cols, $x, $y, $try, $orig) {▼
state $solution;▼
my $sum = $rows + $cols;▼
my $gap = qr/(.{$sum}) (.{$sum})/s;▼
if( $x > $y ) {▼
$x = 0;▼
$solution = $orig |. $try and return if ++$y == $rows; # solved!▼
}▼
while ( $try =~ /(?=(?|$x $gap $y|$y $gap $x))/gx ) { # vertical▼
my $new = $try;▼
substr $new, $-[0], 2*($rows+$cols)+3, " $1+$2 ";▼
find($rows, $cols, $x + 1, $y, $new, $orig );▼
}▼
while ( $try =~ /(?=$x $y|$y $x)/g ) { # horizontal▼
my $new = $try;▼
substr $new, $-[0], 3, ' + ';▼
find($rows, $cols, $x + 1, $y, $new, $orig );▼
}▼
$solution▼
}▼
# NB: not 'blank' lines, need to be full-width white-space
Line 389 ⟶ 364:
1 2 0 1
END
▲sub find ($rows, $cols, $x, $y, $try, $orig) {
▲ state $solution;
▲ my $sum = $rows + $cols;
▲ my $gap = qr/(.{$sum}) (.{$sum})/s;
▲ if( $x > $y ) {
▲ $x = 0;
▲ $solution = $orig |. $try and return if ++$y == $rows; # solved!
▲ }
▲ while ( $try =~ /(?=(?|$x $gap $y|$y $gap $x))/gx ) { # vertical
▲ my $new = $try;
▲ substr $new, $-[0], 2*($rows+$cols)+3, " $1+$2 ";
▲ find($rows, $cols, $x + 1, $y, $new, $orig );
▲ }
▲ while ( $try =~ /(?=$x $y|$y $x)/g ) { # horizontal
▲ my $new = $try;
▲ substr $new, $-[0], 3, ' + ';
▲ find($rows, $cols, $x + 1, $y, $new, $orig );
▲ }
▲ $solution
▲}
say find(7, 8, 0, 0, $grid1, $grid1 ) . "\n=======\n\n";
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