From 1350d722bf57f5617c78cf8ebfd99cc42776d7a0 Mon Sep 17 00:00:00 2001
From: E7-87-83 <fungcheokyin@gmail.com>
Date: Sun, 14 Feb 2021 10:43:13 +0800
Subject: 2 Perl scripts

---
 challenge-096/cheok-yin-fung/perl/ch-1.pl |   4 +-
 challenge-099/cheok-yin-fung/perl/ch-1.pl |  17 +++++
 challenge-099/cheok-yin-fung/perl/ch-2.pl | 110 ++++++++++++++++++++++++++++++
 3 files changed, 129 insertions(+), 2 deletions(-)
 create mode 100644 challenge-099/cheok-yin-fung/perl/ch-1.pl
 create mode 100644 challenge-099/cheok-yin-fung/perl/ch-2.pl

diff --git a/challenge-096/cheok-yin-fung/perl/ch-1.pl b/challenge-096/cheok-yin-fung/perl/ch-1.pl
index 5ff9bce20c..d5ac1f174a 100644
--- a/challenge-096/cheok-yin-fung/perl/ch-1.pl
+++ b/challenge-096/cheok-yin-fung/perl/ch-1.pl
@@ -5,6 +5,6 @@
 
 $_ = $ARGV[0];
 s/(\s)+/ /g ; 
-@a = reverse split / /, $_; 
-print join " ", @a; 
+@a = reverse split / /, $_;
+print join " ", @a;
 print "\n"
diff --git a/challenge-099/cheok-yin-fung/perl/ch-1.pl b/challenge-099/cheok-yin-fung/perl/ch-1.pl
new file mode 100644
index 0000000000..ebe02a984d
--- /dev/null
+++ b/challenge-099/cheok-yin-fung/perl/ch-1.pl
@@ -0,0 +1,17 @@
+#!/usr/bin/perl
+# The Weekly Challenge #099
+# Task 1 Pattern Match
+use strict;
+use warnings;
+
+sub check {
+    my $str = $_[0];
+    my $t_pattern = $_[1];
+
+    $t_pattern =~ s/\*/\\S\+/g;
+    $t_pattern =~ s/\?/\./g;
+
+    return (($str =~ /^$t_pattern$/ )? 1 : 0);
+}
+
+print check($ARGV[0], $ARGV[1]), "\n";
diff --git a/challenge-099/cheok-yin-fung/perl/ch-2.pl b/challenge-099/cheok-yin-fung/perl/ch-2.pl
new file mode 100644
index 0000000000..d487e607a9
--- /dev/null
+++ b/challenge-099/cheok-yin-fung/perl/ch-2.pl
@@ -0,0 +1,110 @@
+#!/usr/bin/perl
+# The Weekly Challenge #099
+# Task 2 Unique Subsequence
+
+# idea: match letter by letter
+
+use strict;
+use warnings;
+
+sub patt_to_word {
+    my $patt = $_[0];
+    my $word = $_[1];
+    my $form;
+    my @p = split ",", $patt;
+    my @w = split "", $word;
+    
+    $form = $p[0] == 0 
+                ? "[" . $w[$p[0]] 
+                : (join "" , @w[0..$p[0]-1]) ."[".$w[$p[0]]  ;
+    my $ptr = $p[0]+1; 
+    
+    for my $k (1..$#p-1) {
+        if ($p[$k] == 0) {
+            $form .= $w[$ptr+$p[$k]];
+        } else {
+            $form .= "]"
+                . (join "", @w[ $ptr .. $ptr+$p[$k]-1 ])
+                . "["
+                 . $w[$ptr+$p[$k]]
+        }
+        $ptr = $ptr+$p[$k]+1;
+    }
+    
+    if ($p[-1] == 0) {
+        $form .= $w[$ptr+$p[-1]]."]";
+    } else {
+        $form .= "]" 
+                . (join "", @w[ $ptr .. $ptr+$p[-1]-1 ])
+                . "["
+                . $w[$ptr+$p[-1]]
+                ."]";
+    }
+    
+    $ptr = $ptr+$p[-1]+1;
+    
+    if ($ptr < $#w) {
+        $form .= (join "", @w[$ptr..$#w]);
+    }
+    
+    return $form;
+}
+
+sub check {
+    my $s_rightsub = $_[0];
+    my $t_pattern = $_[1];
+    my @app = @{$_[2]};
+
+    if ((length $t_pattern) == 1) {     
+        my @last_char_pos;
+        my $i = index($s_rightsub, $t_pattern);
+        while ($i > -1) {
+            push @last_char_pos, $i;
+            $i = index($s_rightsub, $t_pattern, $i+1);
+        }
+        my @new_app;
+        if (scalar @last_char_pos == 0) {
+            @app = map {$_ . "#"} @app;
+            return \@app;
+        } else {
+            for my $k (@last_char_pos) {
+                push @new_app, map {$_ . $k } @app;
+            }
+            return \@new_app;
+        }
+        return \@app;
+    }
+   
+    my @ices; 
+    my $i = index($s_rightsub,substr($t_pattern,0,1));
+    while ($i != -1) {
+       push @ices, $i;
+       $i = index($s_rightsub,substr($t_pattern,0,1), $i+1);
+    }
+    if (!@ices) {
+        my @temp_arr = map {$_ . "#"} @app;
+        return \@temp_arr;
+    }
+
+    my @new_app;
+    for $i (@ices) {
+        my @poss = @{check( substr($s_rightsub, $i+1)
+                     , substr($t_pattern,1) , [""] )};
+        for my $s (@app) { 
+            for my $t (@poss) {
+                if (substr($t, -1, 1) ne "#") {
+                    push @new_app, $s.$i.",".$t;
+                }
+            }
+        }
+    }
+    return \@new_app;
+}
+
+my @ans =  @{check($ARGV[0],$ARGV[1], [""])} ;
+
+if (!@ans) {print "Nothing matches!\n";}
+
+for my $k (0..$#ans) {
+    print $k+1,": ", patt_to_word($ans[$k]  , $ARGV[0]), "\n";
+}
-- 
cgit