Task 2

Files 'grid' and 'words' are the defaults for ch-2.pl.
Files 'grid2' and 'words2' are smaller test files.

5 files changed, 346533 insertions, 0 deletions

diff --git a/challenge-076/perlboy1967/perl/ch-2.pl b/challenge-076/perlboy1967/perl/ch-2.pl
new file mode 100755
index 0000000000..4cabd20746
--- /dev/null
+++ b/challenge-076/perlboy1967/perl/ch-2.pl
@@ -0,0 +1,195 @@
+#!/usr/bin/perl
+
+# Perl Weekly Challenge - 076
+# - https://perlweeklychallenge.org/blog/perl-weekly-challenge-076/
+#
+# Task 2 - Word Search
+#
+# Author: Niels 'PerlBoy' van Dijke
+
+use strict;
+use warnings;
+
+use List::Util qw(max);
+
+my ($gridFilename, $wordsFilename) = @ARGV;
+
+$gridFilename //= 'grid.txt';
+$wordsFilename //= 'words';  # A copy of /usr/share/dict/words
+
+my $minLength = 5;
+
+my @words;
+my %wordsFound;
+my %gridStrings;
+
+my %directions = (
+  HLR => 'Horizontal (left to right)',
+  HRL => 'Horizontal (right to left)',
+  VTB => 'Vertical (top to bottom)',
+  VBT => 'Vertical (bottom to top)',
+  DLRTB => 'Diagonal (left to right and top to bottom)',
+  DLRBT => 'Diagonal (left to right and bottom to top)',
+  DRLTB => 'Diagonal (right to left and top to bottom)',
+  DRLBT => 'Diagonal (right to left and bottom to top)', 
+);
+
+
+sub readWordsFile {
+  my ($fileName, $minL, $arWords) = @_;
+
+  if (!open(fhWords,"< $fileName")) {
+    die "Can't read words from '$fileName' ($!)";
+  } else {
+    while (<fhWords>) {
+      push(@$arWords, $1) 
+        if (/^([a-z]{$minL,})$/);
+    }
+    close(fhWords);
+  }
+}
+
+
+sub readGridFile {
+  my ($fileName, $hrGridStrings) = @_;
+
+  my @grid;
+  my @strings;
+
+  if (!open(fhGrid, "< $fileName")) {
+    die "Can't read grid from '$fileName' ($!)";
+  } else {
+
+    # Read and verify grid width input
+    my $gWidth;
+    my $gHeight;
+    while (<fhGrid>) {
+      $_ = lc($_); 
+      s/[^a-z]//g; 
+
+      $gWidth //= length($_);
+      
+      die "Length of line $. of grid file '$fileName' <> $gWidth [$_]"
+        unless (length($_) == $gWidth);
+
+      push(@grid, [split(//, $_)]);
+    } 
+
+    close(fhWords);
+
+    $gHeight = scalar @grid;
+
+    # Get horizontal,vertical and diagonal strings
+
+    my @colStr;
+
+    # Get horizontal and vertical strings
+    for my $row (0 .. scalar @grid - 1) {
+      my $s = join('', @{$grid[$row]});
+      push(@{$hrGridStrings->{HLR}}, $s);
+      push(@{$hrGridStrings->{HRL}}, scalar reverse $s);
+
+      # Get vertical chars
+      for my $col (0 .. $gWidth - 1) {
+        $colStr[$row] .= $grid[$row][$col];
+      }
+    }
+
+    # Push vertical strings
+    for my $row (0 .. scalar @grid - 1) {
+      push(@{$hrGridStrings->{VTB}}, $colStr[$row]);
+      push(@{$hrGridStrings->{VBT}}, scalar reverse $colStr[$row]);
+    } 
+
+    # Get four diagonal direction strings 
+    for my $y ($minLength - $gWidth .. $gHeight - $minLength) {
+      my $diaTBLR;
+      my $diaTBRL;
+      for my $x (0 .. $gWidth - 1) {
+        my $row = $y + $x;
+        next if ($row < 0 or $row > $gHeight - 1);
+
+        $diaTBLR .= $grid[$row][$x];
+        $diaTBRL .= $grid[$row][$gWidth - 1 - $x];
+      }
+      push(@{$hrGridStrings->{DLRTB}}, $diaTBLR);
+      push(@{$hrGridStrings->{DRLBT}}, scalar reverse $diaTBLR);
+      push(@{$hrGridStrings->{DRLTB}}, $diaTBRL);
+      push(@{$hrGridStrings->{DLRBT}}, scalar reverse $diaTBRL);
+    }
+  }
+}
+
+
+sub findWords {
+  my ($hrGS, $arW, $hrWF) = @_;
+
+  my @directions = keys %$hrGS;
+
+  my $nWords = scalar(@$arW);
+  my $n;
+  
+  print STDERR "Finding Words Progress: ";
+  foreach my $word (@$arW) {
+    print STDERR '.' if ($n++ % int($nWords / 50) == 0);
+    foreach my $direction (@directions) {
+      foreach my $str (@{$hrGS->{$direction}}) {
+        $hrWF->{$word}{$direction}++
+          if ($str =~ m#$word#);
+      }
+    }
+  }
+  print STDERR "\n";
+}
+
+
+sub printReport {
+  my ($arWords, $minL, $hrWordsFound) = @_;
+
+  my @directions = sort keys %directions;
+  my $maxWlen = max(map { length $_} keys %$hrWordsFound);
+
+  my $rowFmt = "%-${maxWlen}s | %5s | %5s | %5s | %5s | %5s | %5s | %5s | %5s\n"; 
+
+  my $sepFmt = $rowFmt; $sepFmt =~ tr/\|/+/;
+  my $sep = sprintf $sepFmt, '-' x $maxWlen, map { '-' x 5 } @directions;
+
+  printf "\n%d uniq words found in grid of length %d or more (using dictionary containing %d words).\n\n", 
+         scalar keys %$hrWordsFound, $minL, scalar @$arWords;
+
+  printf $rowFmt, 'Word', @directions;
+  print $sep;
+
+  foreach my $word (sort keys %$hrWordsFound) {
+    my @values = map { $hrWordsFound->{$word}{$_} // '' } @directions; 
+    printf $rowFmt, 
+           $word,
+           @values;
+  }
+  printf "$sep\n";
+
+  my @legendW = ( 
+    max(map { length } @directions),
+    max(map { length } values %directions)
+  );
+  my $legendFmt = sprintf("%%-%ds | %%-%ds\n", @legendW);
+  $sepFmt = $legendFmt; $sepFmt =~ tr/\|/+/;
+  $sep =  sprintf $sepFmt, map { '-' x $_ } @legendW;
+
+  print "Legend:\n";
+  print "=======\n";
+  print "\n";
+  printf $legendFmt, qw(Key Description);
+  printf $sep;
+  foreach my $direction (@directions) {
+    printf $legendFmt, $direction, $directions{$direction};
+  } 
+  printf $sep;
+}
+
+
+readWordsFile($wordsFilename, $minLength, \@words);
+readGridFile($gridFilename, \%gridStrings);
+findWords(\%gridStrings, \@words, \%wordsFound);
+printReport(\@words, $minLength, \%wordsFound);
+
diff --git a/challenge-076/perlboy1967/perl/grid b/challenge-076/perlboy1967/perl/grid
new file mode 100644
index 0000000000..31cf2e0fd8
--- /dev/null
+++ b/challenge-076/perlboy1967/perl/grid
@@ -0,0 +1,19 @@
+B I D E M I A T S U C C O R S T
+L D E G G I W Q H O D E E H D P
+U S E I R U B U T E A S L A G U
+N G N I Z I L A I C O S C N U D
+T G M I D S T S A R A R E I F G
+S R E N M D C H A S I V E E L I
+S C S H A E U E B R O A D M T E
+H W O V L P E D D L A I U L S S
+R Y O N L A S F C S T A O G O T
+I G U S S R R U G O V A R Y O C
+N R G P A T N A N G I L A M O O
+E I H A C E I V I R U S E S E D
+S E T S U D T T G A R L I C N H
+H V R M X L W I U M S N S O T B
+A E A O F I L C H T O D C A E U
+Z S C D F E C A A I I R L N R F
+A R I I A N Y U T O O O U T P F
+R S E C I S N A B O S C N E R A
+D R S M P C U U N E L T E S I L
diff --git a/challenge-076/perlboy1967/perl/grid2 b/challenge-076/perlboy1967/perl/grid2
new file mode 100644
index 0000000000..5e8a457b37
--- /dev/null
+++ b/challenge-076/perlboy1967/perl/grid2
@@ -0,0 +1,11 @@
+B I D E M I A T
+L D E G G I W Q
+U S E I R U B U
+N G N I Z I L A
+T G M I D S T S
+V R E N M D C I
+S I S H A E C E
+H W R V L A E D
+R Y O U R A S F
+I G U T S R R U
+N R G P A T N A
diff --git a/challenge-076/perlboy1967/perl/words b/challenge-076/perlboy1967/perl/words
new file mode 100644
index 0000000000..0b3dfcce5b
--- /dev/null
+++ b/challenge-076/perlboy1967/perl/words
@@ -0,0 +1,346254 @@
+aahed
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