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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given a binary array containing only 0 or/and 1.
+Write a script to find out the maximum consecutive 1 in the given array.
+
+Example 1
+
+Input: @binary = (0, 1, 1, 0, 1, 1, 1)
+Output: 3
+
+
+Example 2
+
+Input: @binary = (0, 0, 0, 0)
+Output: 0
+
+
+Example 3
+
+Input: @binary = (1, 0, 1, 0, 1, 1)
+Output: 2
+
+=cut
+
+use Test2::V0 -no_srand => 1;
+is(consecutive_one(0, 1, 1, 0, 1, 1, 1), 3, 'Example 1');
+is(consecutive_one(0, 0, 0, 0), 0, 'Example 2');
+is(consecutive_one(1, 0, 1, 0, 1, 1), 2, 'Example 3');
+done_testing();
+
+sub consecutive_one
+{
+     my @arr = @_;
+     my @output = (0);
+     my $counter = 0;
+     for my $elm ( @arr )
+     {
+          if ( 1 == $elm )
+          {
+               $counter++;
+          }
+          else
+          {
+               push @output, $counter;
+               $counter = 0;
+          }
+     }
+     push @output, $counter; # last element.
+     return (sort { $b <=> $a } @output)[0];
+}