blob: 54525d2c84ff5cdf7a841af2bf2e9226ac203b83 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
#!/usr/bin/env perl
# Perl Weekly Challenge 014-1
# https://perlweeklychallenge.org/blog/perl-weekly-challenge-014/
# Write a script to generate Van Eck's sequence starting with 0. For
# more information, please check out wikipedia page at
# https://en.wikipedia.org/wiki/Van_Eck%27s_sequence
use strict;
use warnings;
use feature 'say';
my $N = shift @ARGV || 10;
my @vals;
my $next = 0;
for my $n (0..$N) {
push @vals, $next;
# have we seen it before?
$next = 0;
for (my $i = $n-1; $i >= 0; $i--) {
if ($vals[$i] == $vals[$n]) {
$next = $n - $i;
last;
}
}
}
say join ", ", @vals;
|
