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#!/usr/bin/env perl
# -*- Mode: cperl; cperl-indent-level:4 tab-width: 8; indent-tabs-mode: nil -*-
# -*- coding: utf-8 -*-
use strict; use warnings;
use v5.26;
use Class::Struct;
struct PointInMat => [ row => '$', col => '$' ];
struct HLineInMat => [ row => '$', begin => '$', end => '$' ];
struct SquareInMat => [ row_NW => '$', col_NW => '$',
row_SE => '$', col_SE => '$' ];
struct RunAndShow => [ Run => '$', Show => '$' ];
struct ShowDetails => [ name => '$', attrs => '@' ];
sub combiIndex2 ($) {
my $num_ids = $_[0] -1;
map { my $sel1 = $_;
map { [ $sel1, $_ ] } ($sel1+1) .. $num_ids } 0 .. $num_ids -1;
}
sub readContents {
local $/ = ''; # slurp
my $contents = <STDIN> // '';
$contents
}
# return as an ArrayRef of ArrayRef of PointInMat (grouped by row number)
sub getPointsAtEachRows ($) {
my $raw_string = shift;
my @lines = split( /]\s*/, $raw_string );
[ map {
my ( $r, $c ) = ( $_, 0 );
[ map {
if ( $_ eq '1' ) {
PointInMat->new( row => $r, col => $c++ );
} elsif ( $_ eq '0' ) {
++$c; ()
} else {
()
}
} (split "", $lines[$_]) # charaters
] # group by row
} 0 .. $#lines ]; # return as ArrayRef
}
sub showSomethingInGroup ($$$) {
my ( $listOflist_ref, $spec, $flattening, $nth ) = ( @_[0..2], 1 );
my @list;
if ( $flattening // 1 ) {
@list = map { @$_ } @$listOflist_ref; # flatten
}
else {
@list = @$listOflist_ref;
}
my $listLen = scalar @list;
my $ww = length $listLen; # (w)ord (w)idth: for printf()
say "$listLen ".($spec->name)."(s) found:";
for my $sth (@list) {
printf("%0*d", $ww, $nth++);
say ": (".join(", ", map { "$_:".($sth->$_()) } @{$spec->attrs} ).")";
}
say "";
}
sub showPoints ($) {
@_ = ( $_[0], # data (ArrayRef)
ShowDetails->new( name => 'points',
attrs => [qw(row col)] ),
1 # flattening? yes
);
goto &showSomethingInGroup
}
# return as an ArrayRef of ArrayRef of HLineInMat (grouped by row)
sub getHorizLinesFromPoints ($) {
my $pts_at_all_rows = shift;
[ map {
my $pts_at_the_same_row = $_;
[ map {
my ($p1, $p2) = @{$pts_at_the_same_row}[ @$_ ];
HLineInMat->new( row => $p1->row,
begin => $p1->col, end => $p2->col )
} combiIndex2( scalar @$_ ) ]
} @$pts_at_all_rows ]
}
sub showHorizLines ($) {
@_ = ( $_[0],
ShowDetails->new( name => 'horiz lines',
attrs => [qw(row begin end)] ),
1 # flattening? yes
);
goto &showSomethingInGroup
}
# return as an ArrayRef of PointInMat
sub getSquaresFromHlines ($) {
my @hls_at_all_rows = @{$_[0]}; # copy for sure
my $row_to_scan = 0;
[ map { # combinations of two rows
my ( $hls_r1, $hls_r2 ) = @hls_at_all_rows[ @$_ ];
# permutation of pairs of horizontal lines
# which are selected from one each
map {
my $hl1 = $$hls_r1[$_];
map {
my $hl2 = $$hls_r2[$_];
if ( $hl1->begin == $hl2->begin ) {
my ( $hlen1, $hlen2 )
= map { $_->end - $_->begin } ($hl1, $hl2);
if ( $hlen1 == $hlen2 # rectangle
and
$hlen1 == ( $hl2->row - $hl1->row ) ) {
# square
SquareInMat->new( row_NW => $hl1->row,
col_NW => $hl1->begin,
row_SE => $hl2->row,
col_SE => $hl2->end )
}
else {
()
}
}
else {
()
}
} 0 .. $#{$hls_r2}
} 0 .. $#{$hls_r1}
} combiIndex2( scalar @hls_at_all_rows ) ] # return as ArrayRef
}
sub showSquares ($) {
@_ = ( $_[0],
ShowDetails->new( name => 'square',
attrs => [ qw(row_NW col_NW row_SE col_SE) ] ),
0 # flattening? no
);
goto &showSomethingInGroup
}
my @solutionComposed =
(
# pairs of function, logger in top -> bottom in the same order of exe.
RunAndShow->new( Run => \&readContents, Show => sub { say @_ } ),
# ==>
RunAndShow->new( Run => \&getPointsAtEachRows,
Show => \&showPoints ),
# ==>
RunAndShow->new( Run => \&getHorizLinesFromPoints,
Show => \&showHorizLines ),
# ==>
RunAndShow->new( Run => \&getSquaresFromHlines,
Show => \&showSquares ),
);
our $debug = 1;
my $ball;
my @progress = map {
$ball = $_->Run->($ball);
if ( $debug ) { $_->Show->($ball); }
$ball;
} @solutionComposed;
say "Output: ".(scalar @{$progress[-1]});
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