How to resolve the algorithm Motzkin numbers step by step in the Perl programming language

Published on 12 May 2024 09:40 PM
#Perl

How to resolve the algorithm Motzkin numbers step by step in the Perl programming language

Table of Contents

Problem Statement

The nth Motzkin number (denoted by M[n]) is the number of different ways of drawing non-intersecting chords between n points on a circle (not necessarily touching every point by a chord). By convention M[0] = 1.

Compute and show on this page the first 42 Motzkin numbers or, if your language does not support 64 bit integers, as many such numbers as you can. Indicate which of these numbers are prime.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Motzkin numbers step by step in the Perl programming language

Source code in the perl programming language

#!/usr/bin/perl

use strict; # https://rosettacode.org/wiki/Motzkin_numbers
use warnings;
use ntheory qw( is_prime );

sub motzkin
  {
  my $N = shift;
  my @m = ( 0, 1, 1 );
  for my $i ( 3 .. $N )
    {
    $m[$i] = ($m[$i - 1] * (2 * $i - 1) + $m[$i - 2] * (3 * $i - 6)) / ($i + 1);
    }
  return splice @m, 1;
  }

print "  n          M[n]\n";
my $count = 0;
for ( motzkin(42) )
  {
  printf "%3d%25s  %s\n", $count++, s/\B(?=(\d\d\d)+$)/,/gr,
    is_prime($_) ? 'prime' : '';
  }

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