part 1

2023/07/Part1.pm

@@ -2,10 +2,63 @@ use 5.38.0;
 
 package Part1;
 
-use List::AllUtils qw/ /;
+use List::AllUtils qw/ pairmap sum /;
+use List::UtilsBy qw/ sort_by /;
+
+sub rank_hand(@hand) {
+    @hand = split '', shift @hand if @hand == 1;
+
+    my %group;
+    $group{$_}++ for @hand;
+
+    #use DDP; p %group;
+
+    return 7 if 1 == keys %group;
+
+    return 6 if grep { $_ == 4 } values %group;
+
+    return 5 if keys %group == 2 and grep { $_ == 3 } values %group;
+
+    return 4 if grep { $_ == 3 } values %group;
+
+    return 3 if keys %group == 3;
+
+    return 2 if keys %group == 4;
+
+    return 1;
+}
+
+sub handify($str) {
+    state %map = (
+        'T' => 10,
+        'J' => 11,
+        'Q' => 12,
+        'K' => 13,
+        A => 14
+    );
+
+    my @cards = map { chr( ord('a') + $_ - 2 )} map { $map{$_} // $_ } split '', $str;
+
+    return \@cards;
+}
+
+sub parse_input($input) {
+    my @lines = split "\n", $input;
+    my @hand_score = pairmap { 
+        [ handify($a), $b]
+    } map { split " " } @lines;
+    return @hand_score;
+}
+
+sub score(@hand) {
+    join '', rank_hand(@hand), @hand;
+}
 
 sub solution_1 ($input) {
-    ...;
+    my @hand_score = sort_by { score($_->[0]->@*) } parse_input($input);
+    my $rank = 0;
+    #    use DDP; p @hand_score;
+    return sum map { ++$rank * $_->[1] } @hand_score;
 }
 
 1;

2023/07/example

@@ -0,0 +1,5 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483

2023/07/part1.t

@@ -7,7 +7,21 @@ use Path::Tiny;
 use Part1;
 
 my $input = path('input')->slurp;
+my $example = path('example')->slurp;
 
+is Part1::rank_hand( 'AAAAA') => 7;
+is Part1::rank_hand( 'AA8AA') => 6;
+is Part1::rank_hand( '23332') => 5;
+is Part1::rank_hand( 'TTT98') => 4;
+is Part1::rank_hand( '23432') => 3;
+is Part1::rank_hand( 'A23A4') => 2;
+is Part1::rank_hand( '23456') => 1;
+
+is [ Part1::parse_input( '2345A 123') ] => [
+[ [qw/ a b c d m /], 123 ]
+];
+
+is Part1::solution_1($example) => 6440;
 is Part1::solution_1($input) => 'TODO';
 
 done_testing;

2023/07/solutions.yml

@@ -1,2 +1,2 @@
-1: TODO
+1: 250058342
 2: TODO