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

  • Andy
    2·
    11 months ago

    Factor on github (with comments and imports):

    ! hand: "A23A4"
! card: 'Q'
! hand-bid: { "A23A4" 220 }

: card-key ( ch -- n ) "23456789TJQKA" index ;

: five-kind?  ( hand -- ? ) cardinality 1 = ;
: four-kind?  ( hand -- ? ) sorted-histogram last last 4 = ;
: full-house? ( hand -- ? ) sorted-histogram { [ last last 3 = ] [ length 2 = ] } && ;
: three-kind? ( hand -- ? ) sorted-histogram { [ last last 3 = ] [ length 3 = ] } && ;
: two-pair?   ( hand -- ? ) sorted-histogram { [ last last 2 = ] [ length 3 = ] } && ;
: one-pair?   ( hand -- ? ) sorted-histogram { [ last last 2 = ] [ length 4 = ] } && ;
: high-card?  ( hand -- ? ) cardinality 5 = ;

: type-key ( hand -- n )
  [ 0 ] dip
  { [ high-card? ] [ one-pair? ] [ two-pair? ] [ three-kind? ] [ full-house? ] [ four-kind? ] [ five-kind? ] }
  [ dup empty? ] [
    unclip pick swap call( h -- ? )
    [ drop f ] [ [ 1 + ] 2dip ] if
  ] until 2drop
;

:: (hand-compare) ( hand1 hand2 type-key-quot card-key-quot -- <=> )
  hand1 hand2 type-key-quot compare
  dup +eq+ = [
    drop hand1 hand2 [ card-key-quot compare ] { } 2map-as
    { +eq+ } without ?first
    dup [ drop +eq+ ] unless
  ] when
; inline

: hand-compare ( hand1 hand2 -- <=> ) [ type-key ] [ card-key ] (hand-compare) ;

: input>hand-bids ( -- hand-bids )
  "vocab:aoc-2023/day07/input.txt" utf8 file-lines
  [ " " split1 string>number 2array ] map
;

: solve ( hand-compare-quot -- )
  '[ [ first ] bi@ @ ] input>hand-bids swap sort-with
  [ 1 + swap last * ] map-index sum .
; inline

: part1 ( -- ) [ hand-compare ] solve ;

: card-key-wilds ( ch -- n ) "J23456789TQKA" index ;

: type-key-wilds ( hand -- n )
  [ type-key ] [ "J" within length ] bi
  2array {
    { { 0 1 } [ 1 ] }
    { { 1 1 } [ 3 ] } { { 1 2 } [ 3 ] }
    { { 2 1 } [ 4 ] } { { 2 2 } [ 5 ] }
    { { 3 1 } [ 5 ] } { { 3 3 } [ 5 ] }
    { { 4 2 } [ 6 ] } { { 4 3 } [ 6 ] }
    { { 5 1 } [ 6 ] } { { 5 4 } [ 6 ] }
    [ first ]
  } case
;

: hand-compare-wilds ( hand1 hand2 -- <=> ) [ type-key-wilds ] [ card-key-wilds ] (hand-compare) ;

: part2 ( -- ) [ hand-compare-wilds ] solve ;