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authorYigit Sever2021-12-12 01:24:32 +0300
committerYigit Sever2021-12-12 01:24:32 +0300
commit4bb6f8d06c0e384f3394012b1d48da58ed28cc5e (patch)
treed6478c85c0488a1059567ccd2882cb10039c2546 /2020/day3
parentae3853b6e8ab02023ccd74baac6dc177b1ee879a (diff)
downloadaoc-4bb6f8d06c0e384f3394012b1d48da58ed28cc5e.tar.gz
aoc-4bb6f8d06c0e384f3394012b1d48da58ed28cc5e.tar.bz2
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2020, tracking
Diffstat (limited to '2020/day3')
-rw-r--r--2020/day3/README.md11
-rw-r--r--2020/day3/input323
-rw-r--r--2020/day3/toboggan.pl30
-rw-r--r--2020/day3/toboggans.pl40
4 files changed, 404 insertions, 0 deletions
diff --git a/2020/day3/README.md b/2020/day3/README.md
new file mode 100644
index 0000000..75737af
--- /dev/null
+++ b/2020/day3/README.md
@@ -0,0 +1,11 @@
1# day 3
2
3## first part
4
532 places per row, right 3 and down 1 is
6
7```
8idx = (idx + 3) % 32
9```
10
11per line but this will _probably_ change for the part 2.
diff --git a/2020/day3/input b/2020/day3/input
new file mode 100644
index 0000000..831458f
--- /dev/null
+++ b/2020/day3/input
@@ -0,0 +1,323 @@
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diff --git a/2020/day3/toboggan.pl b/2020/day3/toboggan.pl
new file mode 100644
index 0000000..d424a83
--- /dev/null
+++ b/2020/day3/toboggan.pl
@@ -0,0 +1,30 @@
1use strict;
2use warnings;
3# use Smart::Comments;
4
5open my $fh, '<', "input" or die "no input present, $!";
6
7my $right_m = 3;
8my $toboggan = 0;
9
10my $trees = 0;
11
12while (my $line = <$fh>) {
13 chomp $line;
14
15 ### $line
16 my $curr = substr($line, $toboggan, 1);
17 ### $curr
18
19 if ($curr eq "#") {
20 $trees++;
21 }
22
23 ### $toboggan
24
25 $toboggan = ($toboggan + $right_m) % 31;
26
27}
28
29print($trees);
30
diff --git a/2020/day3/toboggans.pl b/2020/day3/toboggans.pl
new file mode 100644
index 0000000..ebf7ae4
--- /dev/null
+++ b/2020/day3/toboggans.pl
@@ -0,0 +1,40 @@
1use strict;
2use warnings;
3# use Smart::Comments;
4use DDP;
5
6open my $fh, '<', "input" or die "no input present, $!";
7chomp(my @forest = <$fh>);
8close $fh;
9my $len = scalar @forest;
10
11my @right_ms = qw/1 3 5 7 1/;
12my @down_ms = qw/ 1 1 1 1 2/;
13my $runs = $#right_ms;
14
15my $all_trees = 1;
16
17foreach my $run (0..$runs) {
18
19 my $toboggan = 0;
20 my $trees = 0;
21 my $down_mov = $down_ms[$run];
22 my $right_mov = $right_ms[$run];
23
24 for (my $line = 0; $line < $len; $line += $down_mov) {
25 my $curr = substr($forest[$line], $toboggan, 1);
26 if ($curr eq "#") {
27 $trees++;
28 }
29 $toboggan = ($toboggan + $right_mov) % 31;
30 }
31 $trees ||= 1;
32 $all_trees *= $trees;
33 ### this run is
34 ### $right_mov
35 ### $down_mov
36 ### got: $trees
37 ### so far: $all_trees
38}
39
40print("$all_trees");