submission

3 files changed, 83 insertions, 0 deletions

diff --git a/challenge-097/jan-perl/README b/challenge-097/jan-perl/README
new file mode 100644
index 0000000000..70e335d7d7
--- /dev/null
+++ b/challenge-097/jan-perl/README
@@ -0,0 +1 @@
+Solution by Jan Hoogenraad
diff --git a/challenge-097/jan-perl/perl/ch-1.pl b/challenge-097/jan-perl/perl/ch-1.pl
new file mode 100755
index 0000000000..83a7c9bdeb
--- /dev/null
+++ b/challenge-097/jan-perl/perl/ch-1.pl
@@ -0,0 +1,24 @@
+#!/usr/bin/perl
+
+use warnings;
+
+sub inittrs($) {
+  my ($shift) = @_;
+  my $p1=" ";
+  my $p2=" ";
+  for my $t (0..25) {
+     $p1 .= chr(ord('A')+$t);  
+     $p2 .= chr(ord('A')+($t-$shift)%26);
+  }
+  return ($p1,$p2);
+}
+
+$S = "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG";
+$N = 3;
+
+($plain,$cipher)= inittrs($N);
+print "Plain:    $plain\n";
+print "Cipher:   $cipher\n";
+
+eval ("\$S=~ tr/$plain/$cipher/");
+print "$S\n";
diff --git a/challenge-097/jan-perl/perl/ch-2.pl b/challenge-097/jan-perl/perl/ch-2.pl
new file mode 100755
index 0000000000..537c4d4ed6
--- /dev/null
+++ b/challenge-097/jan-perl/perl/ch-2.pl
@@ -0,0 +1,58 @@
+#!/usr/bin/perl
+
+use warnings;
+
+
+sub nflip2(\@\@) {
+  local (*p0arr,*saarr) = @_;
+     my $nftot=0;
+     for my $l (0.. $#p0arr) {
+         $nftot += ($p0arr[$l] != $saarr[$l]);
+     }
+  return $nftot;
+}
+
+sub nflip($\@) {
+  local ($p0,*sa) = @_;
+  my @p0arr = split("",$p0);
+  my $nftot=0;
+  for my $t (@sa){
+     my @saarr = split("",$t);
+     $nftot += nflip2(@p0arr,@saarr);
+  }
+  return $nftot;
+}
+
+sub doit($$) {
+  my ($B,$S) = @_;
+  print "\n$B,$S\n";
+  my @sa=unpack("(a$S)*",$B);
+  my @ba=map {nflip( $_,@sa)} @sa;
+  my $low=$S * @ba;
+  my $lidx=0;
+  for my $t (0 .. $#ba) {
+    if ($low> $ba[$t]){
+        $low= $ba[$t];
+        $lidx=$t;
+    }
+  }
+  print "Output: $ba[$lidx]\n";
+  print "Reference: $lidx: $sa[$lidx]\n";
+  print "Binary Substrings:\n";
+  my @p0arr = split("",$sa[$lidx]);
+  for my $t (@sa) {
+     my @saarr = split("",$t);
+     my $nftot = nflip2(@p0arr,@saarr);
+     print "\"$t\": $nftot flips";
+     print " tot make it \"$sa[$lidx]\"" if ($nftot);
+     print "\n";
+  }  
+}
+
+
+$B = "101100101"; $S = 3;
+doit($B,$S);
+$B = "10110111"; $S = 4;
+doit($B,$S);
+
+