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a045390 @jtpalmer Problem 18, Perl 5.
authored
1 #!/usr/bin/env perl
2 use strict;
3 use warnings;
4 use 5.010;
5 use List::Util qw(max);
6
7 my @triangle = map {
8 [ map { my $x = $_; chomp($x); $x =~ s/^0//g; $x } split( qr{ }, $_ ) ]
9 } <DATA>;
10
11 my @max;
12 $max[$#triangle] = $triangle[$#triangle];
13
14 foreach my $y ( reverse( 0 .. $#triangle - 1 ) ) {
15 foreach my $x ( 0 .. $#{ $triangle[$y] } ) {
16 $max[$y]->[$x] = $triangle[$y]->[$x] + max $max[ $y + 1 ]->[$x],
17 $max[ $y + 1 ]->[ $x + 1 ];
18 }
19 }
20
21 say $max[0]->[0];
22
23 __DATA__
24 75
25 95 64
26 17 47 82
27 18 35 87 10
28 20 04 82 47 65
29 19 01 23 75 03 34
30 88 02 77 73 07 63 67
31 99 65 04 28 06 16 70 92
32 41 41 26 56 83 40 80 70 33
33 41 48 72 33 47 32 37 16 94 29
34 53 71 44 65 25 43 91 52 97 51 14
35 70 11 33 28 77 73 17 78 39 68 17 57
36 91 71 52 38 17 14 91 43 58 50 27 29 48
37 63 66 04 68 89 53 67 30 73 16 69 87 40 31
38 04 62 98 27 23 09 70 98 73 93 38 53 60 04 23
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