2 files changed, 123 insertions, 0 deletions

diff --git a/2020/day10/input b/2020/day10/input
new file mode 100644
index 0000000..8d69912
--- /dev/null
+++ b/2020/day10/input
@@ -0,0 +1,94 @@
+26
+97
+31
+7
+2
+10
+46
+38
+112
+54
+30
+93
+18
+111
+29
+75
+139
+23
+132
+85
+78
+99
+8
+113
+87
+57
+133
+41
+104
+98
+58
+90
+13
+91
+20
+68
+103
+127
+105
+114
+138
+126
+67
+32
+145
+115
+16
+141
+1
+73
+45
+119
+51
+40
+35
+150
+118
+53
+80
+79
+65
+135
+74
+47
+128
+64
+17
+4
+84
+83
+147
+142
+146
+9
+125
+94
+140
+131
+134
+92
+66
+122
+19
+86
+50
+52
+108
+100
+71
+61
+44
+39
+3
+72
diff --git a/2020/day10/joltage.pl b/2020/day10/joltage.pl
new file mode 100644
index 0000000..3a22057
--- /dev/null
+++ b/2020/day10/joltage.pl
@@ -0,0 +1,29 @@
+use strict;
+use warnings;
+use DDP;
+use Smart::Comments;
+use List::Util qw(sum min);
+
+my @jolts = sort { $a <=> $b } map { int } <>;
+
+@jolts = (0, @jolts, $jolts[-1] + 3);
+
+my %diffs;
+
+my $curr = 0;
+
+foreach my $joltage (@jolts) {
+    $diffs{$joltage - $curr}++;
+    $curr = $joltage;
+}
+
+p %diffs;
+
+print($diffs{1} * $diffs{3});
+
+my @memoi = (1);
+for my $k (1..$#jolts) {
+    push @memoi, sum map {$memoi[$k-$_]} grep {$jolts[$k-$_]+3 >= $jolts[$k]} 1..min($k,3);
+}
+
+print "\n$memoi[-1]"