4 changed files with 724 additions and 0 deletions
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1.gitignore
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103day4.rkt
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19day4.test.txt
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601day4.txt
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.DS_Store |
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*~ |
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#lang racket |
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; util |
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(define (split-on lst x) ; like splitOn in haskell. couldn't find this in the std lib.. |
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(foldr (λ (element next) |
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(if (equal? element x) |
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(cons empty next) |
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(cons (cons element (first next)) (rest next)))) |
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(list empty) lst)) |
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(define (map-map f lst) ; why tf can't i do (compose map map) |
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(map (λ (x) (map (λ (y) (f y)) x)) lst)) |
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(define (map-map-map f lst) ; (map . map . map) |
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(map (λ (x) (map-map f x)) lst)) |
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(define (transpose xss) |
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(apply map list xss)) |
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(define (all? f list) |
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(not (findf (λ (x) (not (f x))) list))) |
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; IO and setup |
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(define lines |
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(file->lines "day4.txt")) |
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(define numbers ; grab first line of file, split into a list on , |
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(map string->number (string-split (first lines) ","))) |
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(define boards |
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(let* ([str-lists (split-on (drop lines 2) "")] ; split on empty lines |
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[split-up (map-map string-split str-lists)] ; convert '("1 2 3") to '("1" "2" "3") |
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[num-lists (map-map-map string->number split-up)]) ; convert '("1" "2" "3") to '(1 2 3) |
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(map-map-map (λ (x) (cons x #f)) num-lists))); change each cell to (<number>, <picked>) |
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; part 1 |
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(define (mark-board board number) ; mark up a board with #t or #f based on the number |
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(map-map (λ (cell) |
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(match cell |
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[(cons num on) (cons num (or on (= num number)))])) |
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board)) |
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(define (mark-boards boards number) ; mark all boards based on the number |
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(map (λ (board) (mark-board board number)) boards)) |
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(define (all-winners? lst) ; check if all pairs in the list are #t |
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(all? (λ (x) (match x ([cons _ on] on))) lst)) |
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(define (is-winner? board) ; check if any row or column in the board is a winner |
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(let ([cols (transpose board)]) |
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(or |
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(findf all-winners? board) |
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(findf all-winners? cols)))) |
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(define (mark-all-until-win boards numbers) |
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(foldl (λ (number acc) |
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(match acc |
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([cons boards last-number] |
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(if (findf is-winner? boards) ; if we have any winners |
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(cons boards last-number) ; just return the boards |
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(cons (mark-boards boards number) number))))) ; otherwise keep marking |
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(cons boards 0) numbers)) |
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(define (sum-unmarked board) |
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(let* ([cells (apply append board)] ; flatten it |
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[unmarked (filter (λ (x) (not (cdr x))) cells)] ; filter out marked cells |
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[nums (map car unmarked)]) |
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(foldl + 0 nums))) |
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(define part1 |
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(let* ([marked-up (mark-all-until-win boards numbers)] ; get (the final board state . last number) |
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[marked-boards (car marked-up)] ; car out the boards |
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[last-number (cdr marked-up)] ; cdr out the last number |
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[winning-board (findf is-winner? marked-boards)] ; find the winning board |
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[unmarked-sum (sum-unmarked winning-board)]) ; sum up the unmarked cells |
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(* unmarked-sum last-number))) |
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part1 |
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; part 2 |
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(define (mark-all-until-one boards numbers) |
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(foldl (λ (number acc) |
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(match acc |
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([cons boards last-number] |
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(if (= (length boards) 1) ; if we have only have 1 board left |
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(cons boards last-number) ; just return it |
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(let ([filtered-boards (filter (λ (x) (not (is-winner? x))) boards)]) ; otherwise filter out the winners |
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(cons (mark-boards filtered-boards number) number)))))) ; and then keep marking |
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(cons boards 0) numbers)) |
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(define part2 |
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(let* ([marked-up (mark-all-until-one boards numbers)] ; get (the final board state . last number) |
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[marked-boards (car marked-up)] ; car out the boards |
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[last-number (cdr marked-up)] ; cdr out the last number |
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[winning-board (findf is-winner? marked-boards)] ; find the winning board |
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[unmarked-sum (sum-unmarked winning-board)]) ; sum up the unmarked cells |
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(* unmarked-sum last-number))) |
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part2 |
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7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1 |
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83,69,34,46,30,23,19,75,22,37,89,78,32,39,11,44,95,43,26,48,84,53,94,88,18,40,62,35,27,42,15,2,91,20,4,64,99,71,54,97,52,36,28,7,74,45,70,86,98,1,61,50,68,6,77,8,57,47,51,72,65,3,49,24,79,13,17,92,41,80,63,67,82,90,55,0,10,93,38,21,59,73,33,31,9,76,5,66,16,58,85,87,12,29,25,14,96,56,60,81 |
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54 30 52 70 16 |
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63 49 91 3 51 |
|||
71 36 46 79 67 |
|||
80 66 31 57 43 |
|||
45 9 84 17 35 |
|||
|
|||
68 41 32 23 24 |
|||
95 62 87 97 5 |
|||
16 2 48 17 1 |
|||
59 9 35 96 22 |
|||
50 70 44 89 31 |
|||
|
|||
21 35 47 36 2 |
|||
33 49 77 39 60 |
|||
70 91 97 18 66 |
|||
25 95 22 87 20 |
|||
69 27 76 52 11 |
|||
|
|||
42 40 26 61 98 |
|||
33 88 79 72 73 |
|||
7 57 71 0 82 |
|||
2 21 74 63 41 |
|||
58 96 50 13 4 |
|||
|
|||
80 84 96 31 38 |
|||
58 75 19 91 6 |
|||
10 54 52 66 81 |
|||
55 35 47 23 69 |
|||
95 40 21 17 79 |
|||
|
|||
58 68 27 0 81 |
|||
49 51 93 83 23 |
|||
5 90 8 76 57 |
|||
53 33 45 75 84 |
|||
72 28 38 43 40 |
|||
|
|||
73 62 93 77 17 |
|||
4 89 82 85 18 |
|||
33 57 58 55 49 |
|||
48 11 94 14 72 |
|||
7 53 34 69 21 |
|||
|
|||
19 37 69 48 13 |
|||
5 14 46 2 86 |
|||
40 87 95 79 36 |
|||
81 62 70 23 82 |
|||
51 43 91 29 9 |
|||
|
|||
70 16 3 5 38 |
|||
62 85 19 15 41 |
|||
36 42 13 31 87 |
|||
58 66 27 49 6 |
|||
82 54 91 23 10 |
|||
|
|||
67 63 60 80 66 |
|||
16 30 2 85 97 |
|||
45 52 62 21 49 |
|||
83 75 76 10 82 |
|||
47 90 72 5 9 |
|||
|
|||
3 11 31 61 99 |
|||
42 62 15 64 40 |
|||
30 95 7 81 28 |
|||
63 50 74 77 34 |
|||
38 89 73 2 92 |
|||
|
|||
34 73 60 32 56 |
|||
49 35 44 79 83 |
|||
64 61 57 5 24 |
|||
72 58 8 66 77 |
|||
94 31 55 67 74 |
|||
|
|||
49 17 22 97 88 |
|||
0 16 14 93 31 |
|||
28 73 6 82 90 |
|||
80 45 92 55 78 |
|||
3 42 65 37 29 |
|||
|
|||
23 61 97 1 69 |
|||
53 98 28 52 19 |
|||
66 51 46 77 15 |
|||
34 36 47 80 14 |
|||
7 89 62 9 49 |
|||
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