t Merge branch '2023-08'

2023/08/Part2.pm

@@ -4,32 +4,124 @@ package Part2;
 
 use Part1;
 
-use List::AllUtils qw/all /;
+use List::AllUtils qw/all first_index none min max product /;
+use List::UtilsBy qw/ min_by max_by /;
+    use Math::Utils qw/ lcm /;
+
+sub get_cycle( $current, $directions, $nodes ) {
+
+    my @tracks;
+    my $next_index = 0;
+
+    while() {
+        my $t = join '-',  $current,$next_index;
+        my $i = first_index { $_ eq $t } @tracks;
+        if( $i > -1 ) {
+            my $c = 0;
+            #   p @tracks;
+            # warn $i, " ",$t;
+            return $i, map {
+                $c++;
+                if(/Z-/) {
+                    my $x = $c; $c = 0; $x;
+                }else {
+                    ()
+                }
+            } splice @tracks, $i;
+        }
+        push @tracks, $t;
+        $current = $nodes->{$current}[ $directions->[ $next_index ] ];
+        $next_index = ( $next_index+1)% @$directions;
+    }
+
+
+}
+
+sub find_z($current,$next_index,$directions,$nodes) {
+
+    my $visited    = 0;
+
+    while ( ) {
+        $visited++;
+
+        $current =
+          $nodes->{$current}[ $directions->[ $next_index++ % @$directions ] ];
+
+        last if $current =~ /Z$/ 
+    }
+
+    return $visited, $current, $next_index;
+}
+sub speedrun($current,$next_index,$directions,$nodes,$n) {
+
+        $current =
+          $nodes->{$current}[ $directions->[ $next_index++ % @$directions ] ]
+            for 1..$n;
+
+    return $current;
+}
+
+sub equation_for($current,$directions,$nodes) {
+
+    my $visited = 0;
+    my $next_index=0;
+
+    while ( ) {
+        $visited++;
+
+        $current =
+          $nodes->{$current}[ $directions->[ $next_index++ % @$directions ] ];
+
+        last if $current =~ /Z$/ 
+    }
+
+    my $first = $visited;
+    $visited = 0;
+
+    while ( ) {
+        $visited++;
+
+        $current =
+          $nodes->{$current}[ $directions->[ $next_index++ % @$directions ] ];
+
+        last if $current =~ /Z$/ 
+    }
+
+    my $entry = {  b => $first, m =>  $visited };
+    return $entry;
+}
+
 
 sub solution_2 ($input) {
     my $p          = Part1::parse_input($input);
     my @directions = $p->{directions}->@*;
     my %nodes      = $p->{nodes}->%*;
 
-    my $visited    = 0;
+    my $steps = 0;
+    my @paths = grep { /A$/ } keys %nodes;
     my $next_index = 0;
-    my @current    = grep { /A$/ } keys %nodes;
 
-    until ( all { /Z$/ } @current ) {
-        # use DDP; p @current;
-        # my $foo = <>;
-        $visited++;
+    my @equations = map { equation_for($_,\@directions,\%nodes) } @paths;
 
-        @current = map {
-          $nodes{$_}->[ $directions[ $next_index % @directions ] ]
-      } @current;
-      $next_index++;
+    return lcm map { $_->{b} } @equations;
+
+    for(@equations) {
+        $_->{i} = 1;
+        $_->{total} = $_->{b}+$_->{m};
     }
 
-    return $visited;
+    until( all { $_->{total} == $equations[0]->{total} } @equations ) {
+        my $i = max map { $_->{total} } @equations;
 
+        for(@equations) {
+            while( $_->{total}<$i) {
+                $_->{total}+=$_->{m};
+            }
+        }
+        #   use DDP; p @equations;
+    }
+
+    $equations[0]->{total};
 }
 
 1;
-
-1;

2023/08/benchmark.pl

@@ -36,6 +36,7 @@ for my $part (@parts) {
         language  => 'perl',
         part      => $part->{part},
         time      => $res->cpu_a / $res->iters,
+        persec    => $res->iters / $res->cpu_a,
         timestamp => DateTime->now->iso8601,
     };
     say to_json $result;

2023/08/part2.t

@@ -8,10 +8,7 @@ use File::Serialize;
 use Part2;
 
 my $input = path('input')->slurp;
-my $example   = path('example')->slurp;
-my %solutions = deserialize_file('solutions.yml')->%*;
-
-is Part2::solution_2(<<'END') => 6;
+my $example   = <<END;
 LR
 
 11A = (11B, XXX)
@@ -23,6 +20,24 @@ LR
 22Z = (22B, 22B)
 XXX = (XXX, XXX)
 END
+my %solutions = deserialize_file('solutions.yml')->%*;
+
+
+my $parsed = Part1::parse_input($example);
+#is [Part2::get_cycle('11A',$parsed->{directions},$parsed->{nodes})] => [1,2];
+##use DDP; my @x =  Part2::get_cycle('22A',$parsed->{directions},$parsed->{nodes});p @x;
+#is [Part2::get_cycle('22A',$parsed->{directions},$parsed->{nodes})] => [1,2,3];
+
+
+#is Part2::solution_2($example) => 6;
+
+$parsed = Part1::parse_input($input);
+
+# my @initial = grep { /A$/ } keys $parsed->{nodes}->%*;
+# for (@initial ) {
+#     say join " ", Part2::get_cycle($_,$parsed->{directions},$parsed->{nodes});
+# }
+
 
 is Part2::solution_2($input) => $solutions{2};
 

2023/08/solutions.yml

@@ -1,2 +1,2 @@
 1: 19631
-2: TODO
+2: 21003205388413

2023/benchmark.json

@@ -18,3 +18,6 @@
 {"day":"7","part":2,"persec":85.2380952380952,"year":"2023","timestamp":"2023-12-07T16:08:43","time":0.011731843575419,"language":"perl"}
 {"persec":113.488372093023,"timestamp":"2023-12-09T17:57:35","language":"perl","year":"2023","time":0.00881147540983607,"day":"9","part":1}
 {"persec":109.783631232361,"timestamp":"2023-12-09T17:57:47","language":"perl","time":0.00910882604970008,"day":"9","part":2,"year":"2023"}
+{"day":"8","persec":131.374407582938,"language":"perl","part":1,"time":0.00761183261183261,"timestamp":"2023-12-09T19:45:23","year":"2023"}
+{"day":"8","language":"perl","time":0.0874789915966387,"year":"2023","timestamp":"2023-12-09T20:31:05","persec":11.431316042267,"part":2}
+

2023/cpanfile

@@ -0,0 +1 @@
+requires 'Math::Utils';