Day 7: Camel Cards

Megathread guidelines

  • Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
  • Code block support is not fully rolled out yet but likely will be in the middle of the event. Try to share solutions as both code blocks and using something such as https://topaz.github.io/paste/ , pastebin, or github (code blocks to future proof it for when 0.19 comes out and since code blocks currently function in some apps and some instances as well if they are running a 0.19 beta)

FAQ

🔒 Thread is locked until there’s at least 100 2 star entries on the global leaderboard

🔓 Thread has been unlocked after around 20 mins

  • @voleEnglish
    2•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
        };
    }
}