12 files changed, 370843 insertions, 603 deletions

diff --git a/challenge-014/nikhil-prasanna/perl5/ch-1.pl b/challenge-014/nikhil-prasanna/perl5/ch-1.pl
new file mode 100644
index 0000000000..9b3dcafafe
--- /dev/null
+++ b/challenge-014/nikhil-prasanna/perl5/ch-1.pl
@@ -0,0 +1,45 @@
+use strict;
+use warnings;
+use Data::Dumper;
+#initialising sequence
+my @arr = (0);
+my %sequenceMap =
+    (0 => {
+        'last' => 0,
+    },
+    ) ;
+print $sequenceMap{0}{'last'};
+
+sub vanEck {
+    my $n = shift;
+    return  if $n == 1;
+
+    for my $i (1..$n) {
+        my $lastNumber = $arr[$#arr];
+        my $nextNumber;
+        if ( exists( $sequenceMap{$lastNumber}{'second_last'} )) {
+            $nextNumber = $sequenceMap{$lastNumber}{'last'} - $sequenceMap{$lastNumber}{'second_last'};
+
+
+        } else {
+            $nextNumber = 0;
+        }
+        push(@arr, $nextNumber );
+
+
+        if ( exists($sequenceMap{$nextNumber})) {
+            $sequenceMap{$nextNumber}{'second_last'} = $sequenceMap{$nextNumber}{'last'};
+            $sequenceMap{$nextNumber}{'last'} = $#arr;
+        } else {
+            $sequenceMap{$nextNumber}={'last' => $#arr};
+        }
+    }
+
+}
+
+print "Enter a number upto which you want to find the Van Eck sequence \n";
+my $n = <STDIN>;
+
+vanEck($n);
+print Dumper(\@arr)."\n";
+print Dumper(\%sequenceMap);
diff --git a/challenge-014/nikhil-prasanna/perl5/ch-2.pl b/challenge-014/nikhil-prasanna/perl5/ch-2.pl
new file mode 100644
index 0000000000..034eabec5b
--- /dev/null
+++ b/challenge-014/nikhil-prasanna/perl5/ch-2.pl
@@ -0,0 +1,370148 @@
+use strict;
+use warnings;
+use Data::Dumper;
+my @postalCodes = ("CA", "CO", "DE", "HI", "KS", "MI", "MS", "MA", "NE", "WA", "WI", "MP");
+my %wordHash = map {$_ => 1} @postalCodes;
+
+sub checkIfValid{
+    my $word = shift;
+    for (my $i =0; $i < length($word); $i+=2){
+       my $subString = substr($word, $i, 2);
+      return 0 if !exists($wordHash{uc $subString}) ;
+   }
+    return 1;
+}
+
+
+my @wordList = ();
+my $mxlength = 0;
+# print checkIfValid("cacoda");
+while(my $word = <DATA> ){
+    chomp $word;
+    print "$word";
+    # print "$word\n";
+    # print length($word)."\n";
+    if (checkIfValid($word)) {
+        if ($mxlength < length($word)) {
+            @wordList = ();
+            $mxlength = length($word);
+            push(@wordList, $word);
+        }
+        elsif ($mxlength == length($word)) {
+            push(@wordList, $word);
+        }
+   }
+   print $mxlength;
+
+    print "\n";
+}
+
+
+    print "@wordList";
+
+__DATA__
+
+
+a
+aa
+aaa
+aah
+aahed
+aahing
+aahs
+aal
+aalii
+aaliis
+aals
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