s/part01/part1/

1 files changed, 0 insertions, 134 deletions

diff --git a/aoc/2021/day04/part01.neb b/aoc/2021/day04/part01.neb
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--- a/aoc/2021/day04/part01.neb
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@@ -1,134 +0,0 @@
-;; https://adventofcode.com/2021/day/4
-
-; good candidate for loop-acc
-(func get-all-boards (inp)
-    (def ret (list))
-    (for-count (/ (length inp) 5)
-        (redef ret (append ret
-            (get-board (slice inp (+ (* 5 (- _idx_ 1)) 1) 5)))))
-    ret)
-
-(func get-board (inp)
-    (map get-row inp))
-
-; each row is a string of items
-; separated by (potentially) several spaces
-; return a list of just the strings
-(func get-row (row)
-    (filter
-        (lambda (x)
-            (not (eq? "" x)))
-        (split row " ")))
-            
-
-(func process-boards (inp)
-    (def raw-boards
-        (filter
-            (lambda (x) (not (eq? "" x)))
-            inp))
-    (get-all-boards raw-boards))
-
-(def lines
-    (map strip
-        (read-lines "input.txt")))
-
-(def moves (split (first lines) ",")) ; moves is the first line
-(def boards (process-boards (rest lines)))
-
-; this is a helper to work with zippers
-; probably good to have in the stdlib
-(func unzip (lst idx)
-    (list
-        (reverse
-            (slice lst 1 idx))
-        (slice lst (+ 1 idx))))
-
-(func has-won-row (row)
-    (reduce
-    ;(apply and row))
-        (lambda (acc x)
-            (and acc
-                (int? x)))
-        row
-        #true))
-
-(func has-won (board moves)
-    (def checked (check-board board moves))
-    (def winner #false)
-
-    ; check rows
-    ; no break statement means we have to check everything,
-    ; even after a winner is found
-    ; can also use a while, but that would require more redefs
-    (for-each checked
-        (if (has-won-row _item_)
-            (redef winner #true)))
-
-    ; no break here means we check columns even if we won on rows
-
-    ; check columns
-    (for-count 5
-        (if (has-won-row
-                (map 
-                    (lambda (x) (first (slice x _idx_ 1)))
-                    checked))
-            (redef winner #true)))
-
-    winner)
-
-; this could (should?) be interior to check-board
-(func check-row (row moves)
-    (map
-        (lambda (x)
-            (if (in? x moves)
-                0 ; use an integer
-                x))
-        row))
-
-(func check-board (board my-moves)
-    (map (lambda (x) (check-row x my-moves)) board))
-
-; good candidate for stdlib
-(func extend (lst1 lst2)
-    (reduce append lst2 lst1))
-
-
-; how do we better iterate through this list?
-; called/next would be perfect for a zipper
-(def cur (list (list) moves))  ; init zip
-(def winner #false)
-(while (not winner)
-    (redef cur (unzip moves (+ 1 (length (first cur)))))
-
-    (def win-boards
-        (drop-while boards
-            (not (has-won _item_ (first cur)))))
-
-    ; if win-boards is not empty, we found a winner!
-    (if (not (nil? win-boards))
-        (block
-            (redef winner #true)
-
-            ; result: a 25 element list of ints, where called numbers
-            ; are a 0, and uncalled numbers are their integer equivalents
-            (def winning-board
-                (map
-                    (lambda (x) ; convert all strings to ints
-                        (if (string? x)
-                            (string->int x)
-                            x))
-                    (reduce extend ; flatten the board from 5x5 to 1x25
-                        (check-board  ; check the board, called numbers become 0
-                            (first win-boards)
-                            (first cur))
-                        (list))))
-
-            (def sum-of-uncalled
-                (apply + winning-board))
-
-            ; benefit of zipper -- easy to get recent elements!
-            (def last-called (string->int (first (first cur))))
-
-            (print (concat "sum of uncalled: " (->string sum-of-uncalled)))
-            (print (concat "last called: " (->string last-called)))
-            (print (concat "answer: " (->string (* sum-of-uncalled last-called)))))))