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use DD;
use v5.36;
# my $box = 3;
# my $l = $box*$box;
# my @s= map { 1 + int(rand($l)) } 0..($l*$l-1);
my @s = (4,3,5,2,6,9,7,8,1,
6,8,2,5,7,1,4,9,3,
1,9,7,8,3,4,5,6,2,
8,2,6,1,9,5,3,4,7,
3,7,4,6,8,2,9,1,5,
9,5,1,7,4,3,6,2,8,
5,1,9,3,2,6,8,7,4,
2,4,8,9,5,7,1,3,6,
7,6,3,4,1,8,2,5,9);
# my @s = (1,2,3,4,5,6,7,8,9,
# 4,5,6,5,6,7,8,9,1,
# 7,8,9,6,7,8,9,1,2,
# 4,5,6,7,8,9,1,2,3,
# 5,6,7,8,9,1,2,3,4,
# 6,7,8,9,1,2,3,4,5,
# 7,8,9,1,2,3,4,5,6,
# 8,9,1,2,3,4,5,6,7,
# 9,1,2,3,4,5,6,7,8);
# my @s = map { $_ } 1..81;
# my @s = map { 0 } 0..($l * $l-1);
print_s(@s);
if(check_s(@s)) {
print "valid sudoku!\n";
}
sub print_s {
say scalar(@_);
my $size = sqrt scalar @_;
my $box = sqrt sqrt scalar @_;
say ($size);
say ($box);
print "┌" . "─" x (($size * $box) + 7) . "┐\n";
my $rows=0;
for (my $x = 0; $x < scalar @_; $x+=$size) {
$rows++;
print "│";
for(my $y = 0; $y < $size; $y++) {
print " " . $_[$x+$y] . " " if $_[$x+$y] != 0;
print " - " if $_[$x+$y] == 0;
print " │ " if ($y + 1) % $box == 0;
}
print "\n";
print "├" . "─" x (($size*$box)+7) . "┤\n" if ($rows % $box == 0 && $rows != $size);
}
print "└" . "─" x (($size * $box) + 7) . "┘\n";
}
sub check_s {
my $size = sqrt scalar @_;
my $box = sqrt sqrt scalar @_;
my @correct = map { $_ } 1..$size;
# check rows
for(my $i = 0; $i < $size; $i++) {
my @row = sort { $a <=> $b } uniq(get_row($i, @_));
unless (@row ~~ @correct) {
say "row $i is invalid";
return 0;
}
my @col = sort { $a <=> $b } uniq(get_col($i, @_));
unless (@col ~~ @correct) {
say "col $i is invalid";
return 0;
}
my @box = sort { $a <=> $b } uniq(get_box($i, @_));
unless (@box ~~ @correct) {
say "box $i is invalid";
return 0;
}
}
return 1;
}
sub get_col {
my ($col, @s) = @_;
my $size = sqrt scalar @s;
my $box = sqrt sqrt scalar @s;
my @col;
@col = map { @_[($size*$_+1) + $col] } 0..$size-1;
return @col;
}
sub get_row {
my ($row, @s) = @_;
my $size = sqrt scalar @s;
my $box = sqrt sqrt scalar @s;
my @row;
@row = @_[$row*$size+1..($row*$size+$size)];
return @row;
}
sub get_box {
my ($bnum, @s) = @_;
my $size = sqrt scalar @s;
my $box = sqrt sqrt scalar @s;
my $nboxes = $size;
my $row = int($bnum / 3);
my $row_start = $row*($size*3)+1;
my $start = $row_start + (($bnum % 3)*3);
my @box = map { my $x = $_;
map { $s[($start+$_) + ($size*$x-1)] } 0..$box-1
} 0..$box-1;
return @box;
}
sub uniq {
return do { my %seen; grep { !$seen{$_}++ } @_};
}
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