2019, tracking

19 files changed, 1762 insertions, 0 deletions

diff --git a/2019/day1/README.md b/2019/day1/README.md
new file mode 100644
index 0000000..af0b60e
--- /dev/null
+++ b/2019/day1/README.md
@@ -0,0 +1,5 @@
+I realized part 1 can be solved with a perl one liner;
+
+```bash
+perl -ne '$c += int ($_ / 3) - 2;END {print $c}' < part1.in
+```
diff --git a/2019/day1/part1.in b/2019/day1/part1.in
new file mode 100644
index 0000000..63d0a1a
--- /dev/null
+++ b/2019/day1/part1.in
@@ -0,0 +1,100 @@
+93912
+138996
+112824
+110011
+139024
+132292
+74029
+81664
+138077
+109614
+121056
+136338
+132771
+86611
+131526
+123101
+61315
+93900
+62070
+97957
+67168
+119464
+119066
+111076
+56856
+144203
+109400
+120187
+57915
+143353
+71308
+67695
+141275
+106552
+136209
+86990
+98969
+57207
+99103
+71940
+63145
+91765
+121095
+139700
+128851
+77138
+66712
+91318
+96924
+132235
+99897
+67479
+87996
+121100
+55411
+61715
+130658
+121030
+141445
+83939
+90402
+121107
+59618
+120112
+58140
+103514
+90538
+55552
+142739
+61770
+147374
+80038
+128830
+93328
+52369
+71801
+144536
+147140
+118213
+128056
+92155
+114384
+89234
+124451
+94214
+79174
+108427
+111041
+96715
+128414
+62521
+93897
+107428
+90637
+126176
+78676
+69504
+93663
+80869
+124230
diff --git a/2019/day1/part2.in b/2019/day1/part2.in
new file mode 100644
index 0000000..63d0a1a
--- /dev/null
+++ b/2019/day1/part2.in
@@ -0,0 +1,100 @@
+93912
+138996
+112824
+110011
+139024
+132292
+74029
+81664
+138077
+109614
+121056
+136338
+132771
+86611
+131526
+123101
+61315
+93900
+62070
+97957
+67168
+119464
+119066
+111076
+56856
+144203
+109400
+120187
+57915
+143353
+71308
+67695
+141275
+106552
+136209
+86990
+98969
+57207
+99103
+71940
+63145
+91765
+121095
+139700
+128851
+77138
+66712
+91318
+96924
+132235
+99897
+67479
+87996
+121100
+55411
+61715
+130658
+121030
+141445
+83939
+90402
+121107
+59618
+120112
+58140
+103514
+90538
+55552
+142739
+61770
+147374
+80038
+128830
+93328
+52369
+71801
+144536
+147140
+118213
+128056
+92155
+114384
+89234
+124451
+94214
+79174
+108427
+111041
+96715
+128414
+62521
+93897
+107428
+90637
+126176
+78676
+69504
+93663
+80869
+124230
diff --git a/2019/day1/rec_fuel.py b/2019/day1/rec_fuel.py
new file mode 100644
index 0000000..d837202
--- /dev/null
+++ b/2019/day1/rec_fuel.py
@@ -0,0 +1,23 @@
+import sys
+
+
+def recfuel(mass):
+    """Calculate the fuel required for the module
+    use the new weight of the fuel recursively
+    r(M) = r(M / 3 - 2)
+    """
+    M = mass // 3 - 2
+
+    if M < 0:
+        return 0
+    else:
+        return M + recfuel(M)
+
+
+total = 0
+
+for mass in sys.stdin:
+    ret = recfuel(int(mass))
+    total += ret
+
+print(total)
diff --git a/2019/day2/1202.in b/2019/day2/1202.in
new file mode 100644
index 0000000..6bbbce6
--- /dev/null
+++ b/2019/day2/1202.in
@@ -0,0 +1 @@
+1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,6,1,19,1,5,19,23,2,6,23,27,1,27,5,31,2,9,31,35,1,5,35,39,2,6,39,43,2,6,43,47,1,5,47,51,2,9,51,55,1,5,55,59,1,10,59,63,1,63,6,67,1,9,67,71,1,71,6,75,1,75,13,79,2,79,13,83,2,9,83,87,1,87,5,91,1,9,91,95,2,10,95,99,1,5,99,103,1,103,9,107,1,13,107,111,2,111,10,115,1,115,5,119,2,13,119,123,1,9,123,127,1,5,127,131,2,131,6,135,1,135,5,139,1,139,6,143,1,143,6,147,1,2,147,151,1,151,5,0,99,2,14,0,0
diff --git a/2019/day2/intcode.pl b/2019/day2/intcode.pl
new file mode 100644
index 0000000..984784a
--- /dev/null
+++ b/2019/day2/intcode.pl
@@ -0,0 +1,57 @@
+use strict;
+use warnings;
+use Data::Dumper;
+# use Smart::Comments;
+
+my $inputline = <STDIN>;
+chomp $inputline;
+my @memory = split /,/,  $inputline;
+
+@memory = map {int $_} @memory;
+
+my $op_code_pos = 0;
+my $pos_1 = 1;
+my $pos_2 = 2;
+my $loc_pos = 3;
+my $pc = 4;
+
+my @actions = (sub {print "noop"}, sub {return $_[0] + $_[1]}, sub {return $_[0] * $_[1]});
+
+my $output = 0;
+
+my $one_inc = 0;
+my $two_inc = 0;
+my $turn = 0;
+my @mem = @memory;
+
+foreach my $x (0..99) {
+    foreach my $y (0..99) {
+
+        @mem = @memory;
+        $mem[1] = $x;
+        $mem[2] = $y;
+
+        for (my $add = 0; $add < scalar @mem; $add += $pc) {
+
+            my $op_code = $mem[$add + $op_code_pos];
+            last if ($op_code == 99);
+
+            my $op_1 = $mem[$mem[$add + $pos_1]];
+            my $op_2 = $mem[$mem[$add + $pos_2]];
+            my $loc = $mem[$add + $loc_pos];
+            my $res = $actions[$op_code]->($op_1, $op_2);
+
+            $mem[$loc] = $res;
+        }
+        $output = $mem[0];
+        ### $output
+        exit if $output == 19690720;
+    }
+}
+
+# print Dumper \@mem;
+# print join ',', @mem;
+END {
+    print STDERR "Output: >$mem[0]<\nFor mem[1] = $mem[1] and mem[2] = $mem[2]\n";
+    print 100 * $mem[1] + $mem[2];
+}
diff --git a/2019/day3/part1.in b/2019/day3/part1.in
new file mode 100644
index 0000000..c2e5e1d
--- /dev/null
+++ b/2019/day3/part1.in
@@ -0,0 +1,2 @@
+R998,U494,L814,D519,R407,U983,R307,D745,R64,D29,L935,D919,L272,D473,R689,U560,L942,U264,R816,U745,R209,U227,R241,U111,L653,D108,R823,U254,L263,U987,L368,D76,R665,D646,L759,U425,L581,D826,R829,D388,L234,U33,L48,U598,L708,D764,L414,D75,L163,U802,L183,U893,L486,U947,L393,D694,L454,D600,R377,U312,R89,D178,L652,D751,R402,D946,R213,U985,R994,D336,R573,D105,L442,U965,R603,U508,L17,U191,L37,U678,L506,U823,R878,D709,L348,U167,L355,U314,L164,D672,L309,U895,R358,D769,R869,U598,R63,D68,R105,U133,R357,U588,L154,D631,L939,D235,R506,D885,R958,D896,L195,U292,L952,D616,L824,D497,R99,D121,R387,D155,L70,U580,L890,D368,L910,U645,L786,U977,R9,U781,L454,U783,L382,U321,L195,U196,L239,U764,R18,D71,R97,U77,L803,U963,L704,U94,L511,U747,L798,D905,L679,D135,R455,U650,R947,U14,L722,D245,L490,D183,L276,U559,L901,D767,R827,U522,L380,U494,R402,U70,R589,D582,R206,U756,L989,U427,L704,D864,R885,D9,R872,U454,R912,U752,R197,U304,L728,U879,R456,D410,L141,U473,R246,U498,R443,D297,R333,D123,R12,D665,R684,D531,R601,D13,L260,U60,R302,D514,R416,D496,L562,D334,L608,U74,R451,U251,R961,U166,L368,U146,R962,U973,R120,U808,R480,D536,L690,D958,R292,U333,R656,U305,R46,U831,L756,D907,L638,D969,L445,U541,R784,U148,R338,D264,R72,D637,R759,D709,L611,D34,R99,U305,R143,D191,R673,D753,R387,U994,R720,D896,R95,U703,L499,D453,R96,U808,L485,U127,L856,U357,L543,U382,R411,U969,L532,U64,R303,U457,L412,D140,R146,D67,R147,D681,L1,D994,L876,D504,R46,U683,L992,U640,L663,D681,L327,U840,R543,U97,R988,U792,R36
+L999,U148,L592,D613,L147,D782,R594,U86,R891,D448,R92,U756,R93,D763,L536,U906,L960,D988,L532,U66,R597,U120,L273,D32,R525,U628,L630,U89,L248,U594,R886,D544,L288,U380,L23,D191,L842,U394,L818,U593,L195,U183,L863,D456,L891,D653,R618,U314,L775,D220,R952,U960,R714,U946,L343,D873,L449,U840,R769,U356,L20,D610,L506,U733,R524,D450,L888,D634,R737,U171,R906,U369,L172,D625,L97,D437,R359,D636,R775,U749,L281,U188,R418,D437,R708,D316,L388,D717,R59,U73,R304,U148,L823,U137,R265,U59,R488,D564,R980,U798,L626,U47,L763,U858,L450,U663,R378,U93,L275,U472,L792,U544,R192,D979,L520,U835,L946,D615,L120,U923,L23,U292,R396,U605,L76,U813,L388,U500,L848,U509,L276,D538,R26,D806,R685,D319,R414,D989,L519,U603,R898,D477,L107,D828,R836,U432,L601,U888,L476,D974,L911,U122,L921,D401,L878,D962,L214,D913,L113,U418,R992,U844,L928,U534,L13,U457,L866,D208,L303,D732,L497,U673,R659,D639,R430,D301,L573,U373,L270,D901,L605,D935,R440,D183,R374,D883,L551,U771,R707,D141,R984,U346,R894,U1,R33,U492,R371,D631,R95,D62,L378,D343,R108,D611,L267,D871,L296,U391,R302,D424,R160,U141,R682,U949,R380,U251,L277,D404,R392,D210,L158,U896,R350,D891,L837,D980,R288,U597,L292,D639,L943,D827,L492,D625,L153,D570,R948,D855,L945,U840,L493,U800,L392,D438,R8,U966,R218,U597,R852,D291,L840,D831,L498,U846,R875,D244,R159,U243,R975,D246,R549,D304,R954,D123,R58,U5,L621,U767,R455,U550,R800,D417,R869,D184,L966,D51,L383,U132,L664,U220,L263,D307,R716,U346,L958,U84,L154,U90,L726,U628,L159,U791,L643,D652,L138,U577,R457,U655,L547,D441,L21
diff --git a/2019/day3/smalltest.in b/2019/day3/smalltest.in
new file mode 100644
index 0000000..620a05e
--- /dev/null
+++ b/2019/day3/smalltest.in
@@ -0,0 +1,2 @@
+R75,D30,R83,U83,L12,D49,R71,U7,L72
+U62,R66,U55,R34,D71,R55,D58,R83
diff --git a/2019/day3/wires.pl b/2019/day3/wires.pl
new file mode 100644
index 0000000..fa4ddf1
--- /dev/null
+++ b/2019/day3/wires.pl
@@ -0,0 +1,68 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+use List::Util 'min';
+# use Smart::Comments;
+use Data::Dumper;
+
+sub manhattan_distance {
+    my $ref = shift;
+    my ($x, $y) = @{$ref};
+
+    return abs(0 - $x) + abs(0 - $y);
+}
+
+sub pedometer {
+    my $ref = shift;
+    my ($x, $y, $step_1, $step_2) = @{$ref};
+    return $step_1 + $step_2;
+}
+
+my %directions = (
+    'U' => [0, 1],
+    'D' => [0,-1],
+    'R' => [1, 0],
+    'L' => [-1,0]
+);
+
+my $turn = 0;
+my @intersections = ();
+my %map;
+
+while(<>) {
+    chomp;
+    my @path = split /,/;
+    my @coord = (0,0); # Starting point
+    my $num_steps = 0;
+
+    if (!$turn){
+        foreach my $way (@path) {
+            my ($dir, $speed) = ($1, $2) if ($way =~ /(\w)(\d+)/) or die "$!";
+            for (1..$speed) {
+                $coord[0] += @{$directions{$dir}}[0];
+                $coord[1] += @{$directions{$dir}}[1];
+                $num_steps++;
+                $map{"$coord[0],$coord[1]"} = $num_steps;
+            }
+        }
+        $turn = !$turn;
+    } else {
+        foreach my $way (@path) {
+            my ($dir, $speed) = ($1, $2) if ($way =~ /(\w)(\d+)/) or die "$!";
+            for (1..$speed) {
+                $coord[0] += @{$directions{$dir}}[0];
+                $coord[1] += @{$directions{$dir}}[1];
+                $num_steps++;
+                if (exists $map{"$coord[0],$coord[1]"}) {
+                    push @intersections, [@coord,$num_steps,$map{"$coord[0],$coord[1]"}];
+                }
+            }
+        }
+    }
+}
+
+# print Dumper \@intersections;
+print(min(map {pedometer($_);} @intersections));
+
+
diff --git a/2019/day4/password.lp b/2019/day4/password.lp
new file mode 100644
index 0000000..b9a1f1a
--- /dev/null
+++ b/2019/day4/password.lp
@@ -0,0 +1,17 @@
+%353096-843212
+digit(X) :- X = 0..9.
+place(N) :- N = 1..6.
+
+1 {pass(Q,X) : digit(X)} 1 :- place(Q).
+value(N) :- N = A + B * 10 + C * 100 + D * 1000 + E * 10000 + F * 100000, pass(6,A), pass(5,B), pass(4,C), pass(3,D), pass(2,E), pass(1,F).
+
+:- value(N), N < 353096.
+:- value(N), N > 843212.
+
+:- pass(Q,X), pass(Q', Y), Q' = Q + 1, X > Y.
+%:- pass(Q,X), pass(Q', Y), pass(QQ, Z), Q' = Q + 1, QQ = Q' + 1, X = Y, Y = Z. % I couldn't figure out this so I did 581 - 2
+
+%1 {target(X,Y,XX,YY) : dir(DX,DY), XX-X = DX*S, YY-Y = DY*S, size(S), area(XX,YY,_)} 1 :- number(X,Y,_).
+
+#show pass/2.
+#show value/1.
diff --git a/2019/day4/password.pl b/2019/day4/password.pl
new file mode 100644
index 0000000..403cf91
--- /dev/null
+++ b/2019/day4/password.pl
@@ -0,0 +1,29 @@
+use strict;
+use warnings;
+
+use Data::Dumper;
+
+my $low_bound = 353096;
+my $upper_bound = 843212;
+
+my $count = 0;
+
+for (my $number = $low_bound; $number < $upper_bound; $number++) {
+    my @nums = split //, $number;
+    my @cmp = sort {$a <=> $b} @nums;
+    if (@nums == @cmp and join ("\0", @nums) eq join ("\0", @cmp)) {
+        my %digits = ();
+        foreach (@nums) {
+            $digits{$_}++;
+        }
+        foreach my $reps (values %digits) {
+            if ($reps == 2) {
+                print "$number\n";
+                $count++;
+                last;
+            }
+        }
+    }
+}
+
+print ">$count\n";
diff --git a/2019/day5/intcode.pl b/2019/day5/intcode.pl
new file mode 100644
index 0000000..613f067
--- /dev/null
+++ b/2019/day5/intcode.pl
@@ -0,0 +1,92 @@
+use strict;
+use warnings;
+use Data::Dumper;
+# use Smart::Comments;
+use v5.10;
+
+sub pos {
+    my ($tape_ref, $index) = @_;
+    my @tape = @{ $tape_ref };
+    ### returning: $tape[$tape[$index]]
+    ### for: $index
+    return $tape[$tape[$index]];
+}
+
+sub imm {
+    my ($tape_ref, $index) = @_;
+    my @tape = @{ $tape_ref };
+    return $tape[$index];
+}
+
+my $inputline = <STDIN>;
+chomp $inputline;
+my @tape = split /,/,  $inputline;
+
+my $pc = 0; # program counter is no longer consistent
+
+my @actions = (
+    sub { print "noop" },                 # no opcode 0
+    sub { return $_[0] + $_[1] },         # 1
+    sub { return $_[0] * $_[1] },         # 2
+    sub { return 5; },                    # 3
+    sub { say $_[0]; },                   # 4
+    sub { return $_[0] ? $_[1] : -1 },    # 5, ugh, you might want to jump to 0
+    sub { return $_[0] ? -1 : $_[1] },    # 6
+    sub { return $_[0] < $_[1] ? 1 : 0},  # 7
+    sub { return $_[0] == $_[1] ? 1 : 0}, # 8
+);
+
+my @modes = (\&pos, \&imm);
+my %offsets = qw/1 4 2 4 3 2 4 2 5 3 6 3 7 4 8 4 99 1/;
+my $inst_ptr = 0;
+
+while ( 1 ) {
+
+    my $raw_op_code = $tape[$inst_ptr];
+    last if ($raw_op_code == 99);
+
+    # print("====================================\n");
+
+    my @modes_and_opcode;
+    push @modes_and_opcode, $_ // 0 for $raw_op_code =~ m/^(\d)??(\d)??(\d)??0?(\d)$/g;
+    ### @modes_and_opcode
+
+    my $op_code = pop @modes_and_opcode;
+    ### $op_code
+
+    # foreach my $x (0..5) {
+    #     print("TAPE[" . ($inst_ptr + $x) . "] = $tape[($inst_ptr + $x)]\n")
+    # }
+
+    my $toread = $offsets{$op_code} - 1; # excluding opcode
+    my @params;
+    foreach my $offset (1..$toread) {
+        push @params, $modes[ (!($op_code == 4 || $op_code == 5 || $op_code == 6) && $offset == $toread) ? 1 : pop @modes_and_opcode ]->(\@tape, $inst_ptr + $offset);
+    }
+    ### @params
+
+    $inst_ptr += $offsets{$op_code};
+
+    if ($op_code == 1 || $op_code == 2 || $op_code == 7 || $op_code == 8) { # arithmetic
+        my $res = $actions[$op_code]->($params[0], $params[1]);
+        $tape[$params[2]] = $res;
+        ### writing: $res
+        ### on address: $params[2]
+    }
+    elsif ($op_code == 3) { # input
+        my $res = $actions[$op_code]->();
+        $tape[$params[0]] = $res;
+        ### saved: $res
+        ### on: $params[0]
+    } elsif ($op_code == 4) { # output
+        $actions[$op_code]->($params[0]);
+    } elsif ($op_code == 5 || $op_code == 6) { # jumps
+        my $res = $actions[$op_code]->($params[0], $params[1]);
+        $inst_ptr = $res == -1 ? $inst_ptr : $res;
+        ### jumped to: $inst_ptr
+        next;
+    } else {
+        ### OH NO...
+        die;
+    }
+}
diff --git a/2019/day5/part1.in b/2019/day5/part1.in
new file mode 100644
index 0000000..9d9b84d
--- /dev/null
+++ b/2019/day5/part1.in
@@ -0,0 +1 @@
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diff --git a/2019/day6/orbits.pl b/2019/day6/orbits.pl
new file mode 100644
index 0000000..9f4aed5
--- /dev/null
+++ b/2019/day6/orbits.pl
@@ -0,0 +1,39 @@
+use strict;
+use warnings;
+
+my $file_name = $ARGV[0];
+
+if (not defined $file_name) {
+    die "missing filename\n";
+}
+
+open my $fh, "<", $file_name or die "Can't open $file_name, $!\n";
+
+my %orbit;
+
+while (<$fh>) {
+    chomp;
+    my ($from, $to) = split /\)/;
+    push @{ $orbit{$from} }, $to;
+}
+
+close $fh;
+
+my @to_value = ('---', 'COM');
+my $dist = 0;
+my $total = 0;
+
+while ( 1 ) {
+
+    my $cur = pop @to_value;
+
+    print $total and exit unless @to_value;
+
+    if ($cur eq '---') {
+        unshift @to_value, '---';
+        $dist++;
+    } else {
+        $total += $dist;
+        unshift @to_value, @{ $orbit{$cur} } if exists $orbit{$cur};
+    }
+}
diff --git a/2019/day6/orbits.py b/2019/day6/orbits.py
new file mode 100644
index 0000000..652256f
--- /dev/null
+++ b/2019/day6/orbits.py
@@ -0,0 +1,28 @@
+# this solves part 2
+import sys
+
+import networkx as nx
+
+
+def main(argv):
+
+    G = nx.DiGraph()
+    with open(argv[0]) as fp:
+        for line in fp:
+            line = line.rstrip("\n")
+            start, end = line.split(")")
+            G.add_node(start, label=start)
+            G.add_node(end, label=end)
+            G.add_edge(start, end)
+
+    jump_to = nx.lowest_common_ancestor(G, "SAN", "YOU")  # SAN and YOU are given
+    jumps = (
+        len(nx.shortest_path(G, jump_to, "SAN"))
+        + len(nx.shortest_path(G, jump_to, "YOU"))
+        - 4
+    )  # 4 because len includes start and end, so -2 times 2
+    print(jumps)
+
+
+if __name__ == "__main__":
+    main(sys.argv[1:])
diff --git a/2019/day6/part1.in b/2019/day6/part1.in
new file mode 100644
index 0000000..8cafbd0
--- /dev/null
+++ b/2019/day6/part1.in
@@ -0,0 +1,1069 @@
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diff --git a/2019/day7/comm.py b/2019/day7/comm.py
new file mode 100644
index 0000000..458d8b1
--- /dev/null
+++ b/2019/day7/comm.py
@@ -0,0 +1,19 @@
+from itertools import permutations
+import os
+import subprocess
+
+perm = permutations(range(5))
+res = []
+
+for seq in perm:
+    signal = 0
+    for phase in seq:
+        out = subprocess.run(
+            ["perl", "intcode.pl", "part1.in"],
+            capture_output=True,
+            input=b"%d\n%d" % (phase, signal),
+        )
+        signal = int(out.stdout)
+    res.append(signal)
+
+print(sorted(res)[-1])
diff --git a/2019/day7/intcode.pl b/2019/day7/intcode.pl
new file mode 100644
index 0000000..d83d2db
--- /dev/null
+++ b/2019/day7/intcode.pl
@@ -0,0 +1,109 @@
+use strict;
+use warnings;
+use Data::Dumper;
+# use Smart::Comments;
+use v5.10;
+
+$| = 1;
+
+sub pos {
+    my ($tape_ref, $index) = @_;
+    my @tape = @{ $tape_ref };
+    ### returning: $tape[$tape[$index]]
+    ### for: $index
+    return $tape[$tape[$index]];
+}
+
+sub imm {
+    my ($tape_ref, $index) = @_;
+    my @tape = @{ $tape_ref };
+    return $tape[$index];
+}
+
+my $file_name = $ARGV[0];
+
+if (not defined $file_name) {
+    die "missing filename\n";
+}
+
+open my $fh, "<", $file_name or die "Can't open $file_name, $!\n";
+
+my $inputline = <$fh>;
+chomp $inputline;
+my @tape = split /,/,  $inputline;
+close $fh;
+
+my $pc = 0; # program counter is no longer consistent
+
+my @actions = (
+    sub { print "noop" },                 # no opcode 0
+    sub { return $_[0] + $_[1] },         # 1
+    sub { return $_[0] * $_[1] },         # 2
+    sub {
+        print STDERR ("Getting input!\n");
+        my $in = <STDIN>;
+        print STDERR ("Read >$in<\n");
+        chomp $in;
+        return $in;
+    },                    # 3
+    sub { say $_[0]; },                   # 4
+    sub { return $_[0] ? $_[1] : -1 },    # 5, ugh, you might want to jump to 0
+    sub { return $_[0] ? -1 : $_[1] },    # 6
+    sub { return $_[0] < $_[1] ? 1 : 0},  # 7
+    sub { return $_[0] == $_[1] ? 1 : 0}, # 8
+);
+
+my @modes = (\&pos, \&imm);
+my %offsets = qw/1 4 2 4 3 2 4 2 5 3 6 3 7 4 8 4 99 1/;
+my $inst_ptr = 0;
+
+while ( 1 ) {
+
+    my $raw_op_code = $tape[$inst_ptr];
+    last if ($raw_op_code == 99);
+
+    # print("====================================\n");
+
+    my @modes_and_opcode;
+    push @modes_and_opcode, $_ // 0 for $raw_op_code =~ m/^(\d)??(\d)??(\d)??0?(\d)$/g;
+    ### @modes_and_opcode
+
+    my $op_code = pop @modes_and_opcode;
+    ### $op_code
+
+    # foreach my $x (0..5) {
+    #     print("TAPE[" . ($inst_ptr + $x) . "] = $tape[($inst_ptr + $x)]\n")
+    # }
+
+    my $toread = $offsets{$op_code} - 1; # excluding opcode
+    my @params;
+    foreach my $offset (1..$toread) {
+        push @params, $modes[ (!($op_code == 4 || $op_code == 5 || $op_code == 6) && $offset == $toread) ? 1 : pop @modes_and_opcode ]->(\@tape, $inst_ptr + $offset);
+    }
+    ### @params
+
+    $inst_ptr += $offsets{$op_code};
+
+    if ($op_code == 1 || $op_code == 2 || $op_code == 7 || $op_code == 8) { # arithmetic
+        my $res = $actions[$op_code]->($params[0], $params[1]);
+        $tape[$params[2]] = $res;
+        ### writing: $res
+        ### on address: $params[2]
+    }
+    elsif ($op_code == 3) { # input
+        my $res = $actions[$op_code]->();
+        $tape[$params[0]] = $res;
+        ### saved: $res
+        ### on: $params[0]
+    } elsif ($op_code == 4) { # output
+        $actions[$op_code]->($params[0]);
+    } elsif ($op_code == 5 || $op_code == 6) { # jumps
+        my $res = $actions[$op_code]->($params[0], $params[1]);
+        $inst_ptr = $res == -1 ? $inst_ptr : $res;
+        ### jumped to: $inst_ptr
+        next;
+    } else {
+        ### OH NO...
+        die;
+    }
+}
diff --git a/2019/day7/part1.in b/2019/day7/part1.in
new file mode 100644
index 0000000..a700dd4
--- /dev/null
+++ b/2019/day7/part1.in
@@ -0,0 +1 @@
+3,8,1001,8,10,8,105,1,0,0,21,46,59,72,93,110,191,272,353,434,99999,3,9,101,4,9,9,1002,9,3,9,1001,9,5,9,102,2,9,9,1001,9,5,9,4,9,99,3,9,1002,9,5,9,1001,9,5,9,4,9,99,3,9,101,4,9,9,1002,9,4,9,4,9,99,3,9,102,3,9,9,101,3,9,9,1002,9,2,9,1001,9,5,9,4,9,99,3,9,1001,9,2,9,102,4,9,9,101,2,9,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,101,2,9,9,4,9,99,3,9,101,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,101,1,9,9,4,9,99,3,9,101,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,2,9,9,4,9,99,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,1001,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,99,3,9,1001,9,1,9,4,9,3,9,1001,9,1,9,4,9,3,9,1001,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,99