Day 7: Camel Cards

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  • vole@lemmy.world
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    1 year ago

    Raku

    My hand-type strength calculations could probably be trimmed down a bit. I didn’t hit any big issues today.

    View code on github

    Code (note: doesn't currently display correctly on Lemmy website)
    use v6;
    
    sub MAIN($input) {
        my $file = open $input;
    
        grammar CamelCards {
            token TOP { +%"\n" "\n"*}
            token row {  " "  }
            token hand { \S+ }
            token bid { \d+ }
        }
    
        my $camel-cards = CamelCards.parse($file.slurp);
        my @rows = $camel-cards.map({ (..Str, ..Int) });
        my @ranked-rows1 = @rows.sort({hand-strength($_[0], &hand-type-strength1, '23456789TJQKA'.comb)});
        my $part-one-solution = (@ranked-rows1»[1] Z* 1..*).sum;
        say "part 1: $part-one-solution";
    
        my @ranked-rows2 = @rows.sort({hand-strength($_[0], &hand-type-strength2, 'J23456789TQKA'.comb)});
        my $part-two-solution = (@ranked-rows2»[1] Z* 1..*).sum;
        say "part 2: $part-two-solution";
    }
    
    sub hand-strength($hand, &hand-type-strength, @card-strengths) {
        my $strength = &hand-type-strength($hand);
        for $hand.comb -> $card {
            $strength = $strength +< 8 + @card-strengths.first({ $_ eq $card }, :k);
        }
        return $strength;
    }
    
    sub hand-type-strength1($hand) {
        my @sorted = $hand.comb.sort;
        my @runs = [1];
        my $card = @sorted[0];
        for @sorted[1..*] -> $new-card {
            if $new-card eq $card {
                @runs.tail += 1;
            } else {
                @runs.push(1);
                $card = $new-card;
            }
        }
        return do given @runs.sort {
            when .[0] == 5 { 6 } # Five of a kind
            when .[1] == 4 { 5 } # Four of a kind
            when .[1] == 3 { 4 } # Full House
            when .[2] == 3 { 3 } # Three of a kind
            when .[1] == 2 { 2 } # Two pair
            when .[3] == 2 { 1 } # One pair
            default { 0 } # High card
        };
    }
    
    sub hand-type-strength2($hand) {
        my @sorted = $hand.comb.grep(none /J/).sort;
        if @sorted.elems == 0 {
            return 6;
        } else {
            my @runs = [1];
            my $card = @sorted[0];
            for @sorted[1..*] -> $new-card {
                if $new-card eq $card {
                    @runs.tail += 1;
                } else {
                    @runs.push(1);
                    $card = $new-card;
                }
            }
            @runs.=sort;
            @runs.tail += 5 - @sorted.elems;
            return do given @runs {
                when .[0] == 5 { 6 } # Five of a kind
                when .[1] == 4 { 5 } # Four of a kind
                when .[1] == 3 { 4 } # Full House
                when .[2] == 3 { 3 } # Three of a kind
                when .[1] == 2 { 2 } # Two pair
                when .[3] == 2 { 1 } # One pair
                default { 0 } # High card
            };
        }
    }