Add Gustavo Chaves's solutions to challenge 100

2 files changed, 85 insertions, 0 deletions

diff --git a/challenge-100/gustavo-chaves/perl/ch-1.pl b/challenge-100/gustavo-chaves/perl/ch-1.pl
new file mode 100755
index 0000000000..0e9a618526
--- /dev/null
+++ b/challenge-100/gustavo-chaves/perl/ch-1.pl
@@ -0,0 +1,44 @@
+#!/usr/bin/env perl
+
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-100/
+# TASK #1 › Fun Time
+
+use 5.030;
+use warnings;
+
+my $input = shift;
+
+if ($input =~ /^(?<hour>\d{2}):(?<minute>\d{2})$/) {
+    if ($+{hour} eq '00') {
+        print '12';
+    } elsif ($+{hour} le '12') {
+        print $+{hour};
+    } else {
+        printf '%02d', $+{hour} - 12;
+    }
+    print ":$+{minute}";
+    if ($+{hour} lt '12') {
+        print 'am';
+    } else {
+        print 'pm';
+    }
+} elsif ($input =~ /^(?<hour>\d{2}):(?<minute>\d{2}) ?(?<period>am|pm)$/) {
+    if ($+{period} eq 'am') {
+        if ($+{hour} eq '12') {
+            print '00';
+        } else {
+            print $+{hour};
+        }
+    } else {
+        if ($+{hour} eq '12') {
+            print $+{hour};
+        } else {
+            printf '%02d', $+{hour} + 12;
+        }
+    }
+    print ":$+{minute}";
+} else {
+    die "Invalid time '$input'\n";
+}
+
+print "\n";
diff --git a/challenge-100/gustavo-chaves/perl/ch-2.pl b/challenge-100/gustavo-chaves/perl/ch-2.pl
new file mode 100755
index 0000000000..e3231e4f5b
--- /dev/null
+++ b/challenge-100/gustavo-chaves/perl/ch-2.pl
@@ -0,0 +1,41 @@
+#!/usr/bin/env perl
+
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-100/
+# TASK #2 › Triangle Sum
+
+use 5.030;
+use warnings;
+
+my @triangles = (
+    [ [1], [2,4], [6,4,9], [5,1,7,2] ],
+    [ [3], [3,1], [5,2,3], [4,3,1,3] ],
+);
+
+for my $i (0 .. $#triangles) {
+    say "$i: ", triangle_sum($triangles[$i]);
+}
+
+sub triangle_sum {
+    my ($triangle) = @_;
+
+    my $min = 2 ** 30;
+
+    my $find_minimum_sum = sub {
+        my ($row, $col, $acc) = @_;
+
+        $acc += $triangle->[$row][$col];
+
+        if ($row == $#$triangle) {
+            $min = $acc if $acc < $min;
+        } elsif ($min > $acc) {
+            __SUB__->($row+1, $col,   $acc);
+            __SUB__->($row+1, $col+1, $acc);
+        }
+        return;
+    };
+
+    $find_minimum_sum->(0, 0, 0);
+
+    return $min;
+}
+