Added file challenge 209

1 files changed, 43 insertions, 0 deletions

diff --git a/challenge-209/solathian/perl/ch-1.pl b/challenge-209/solathian/perl/ch-1.pl
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+++ b/challenge-209/solathian/perl/ch-1.pl
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+#!usr/bin/perl
+use v5.36;
+
+# Challenge 209 - 1 - Special Bit Characters
+# You are given an array of binary bits that ends with 0.
+
+# Valid sequences in the bit string are:
+
+# [0] -decodes-to-> "a"
+# [1, 0] -> "b"
+# [1, 1] -> "c"
+
+
+# bits();               # error: array is empty
+# bits(1);              # error: array is not ending with 0
+
+bits(0, 0, 0);              # 1
+bits(1, 0, 0);              # 1
+bits(1, 1, 1, 0);           # 0
+bits(0, 1, 1, 1, 0);        # 0
+bits(0, 1, 0, 1, 1, 0);     # 1
+bits(0, 1, 0, 1, 1, 0, 0);  # 1
+bits(1, 0, 1, 1, 0, 0);     # 1
+bits(1, 0, 0, 1, 1, 0);     # 1
+
+
+sub bits(@array)
+{
+
+    die"Array is empty"                if(@array == 0);
+    die"Array is not ending with 0"    if( $array[-1] != 0);
+
+
+    while(@array > 1)
+    {
+        # shift once if the first character is 0, shift twice if it is a two bit character
+        shift @array   if( $array[0] == 1 );
+        shift @array;
+    }
+    
+    say "0"     if(@array == 0);
+    say "1"     if(@array == 1);
+}
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