3 files changed, 670 insertions, 0 deletions
diff --git a/day04 b/day04
new file mode 100644
index 0000000..5c0109d
--- /dev/null
+++ b/day04
@@ -0,0 +1,601 @@
+23,91,18,32,73,14,20,4,10,55,40,29,13,25,48,65,2,80,22,16,93,85,66,21,9,36,47,72,88,58,5,42,53,69,52,8,54,63,76,12,6,99,35,95,82,49,41,17,62,34,51,77,94,7,28,71,92,74,46,79,26,19,97,86,87,37,57,64,1,30,11,96,70,44,83,0,56,90,59,78,61,98,89,43,3,84,67,38,68,27,81,39,15,50,60,24,45,75,33,31
+
+67 97 50 51  1
+47 15 77 31 66
+24 14 55 70 52
+76 46 19 32 73
+34 22 54 75 17
+
+44 11 97 50 71
+66  7 24  9 67
+88 39 82 93 57
+77  5  6 58 51
+85 61 65 70 23
+
+72 74 58 71 41
+ 4 57 45 89 67
+78 55 66 28 48
+82 61 87 85 84
+96  8 94 76 97
+
+25 33 45 16 68
+60 27 22 13 29
+92 95 93 50 36
+43  1 66 51 99
+85 14 20 52 58
+
+65 47 18 50 90
+44 25 11 70 81
+86 36 45 10 85
+43 89 74  0 14
+97 59 32 91  5
+
+64 19 39 69 90
+41  5 59 37 42
+75 95 58 89 92
+20  3 85 48 71
+31 94 11 18 70
+
+30 17 56 54 79
+63 12 51 57  5
+95 16 98 75 69
+80 87 71 39 48
+66 14 99 42 31
+
+27 35 46 69 50
+ 3 16 84 39 42
+19 22 34 80 72
+40 54 66 30 10
+12 67 36  9 74
+
+39 47 61  3 35
+15 33 45 79 58
+96 53 20 80 19
+75 85 73  6 64
+43 88 72 69 37
+
+52 68 12 23 59
+79 32 37 87 69
+48 31  4 36 51
+77  2 92 67  8
+13 88 93 98 20
+
+12 54 34 13 27
+79 85 62 76 71
+52 84 65 93 66
+40 89 73 95 74
+29 70 32 11 41
+
+54 56 53 55 78
+21 85 43 75 79
+62 66 14 84  2
+32 13 83 38  7
+15 71 81 63 49
+
+83  7 51 49 50
+89 59  9 72 80
+99 41 65 13 64
+74 95 75 54 90
+53 79 58 40  5
+
+36 16 46 71 87
+73 13 84  3 38
+69 88 85 28 68
+63 94  0 86  1
+49 44 65 39 15
+
+55 27 91 44 39
+ 6 75 14 22 99
+38 89 92 42 11
+20 60  3 70 15
+ 5 19 78 88 81
+
+16 90 29 52 86
+60 61 96 47 91
+19 59 10 14  4
+18 35 50 20 25
+56  2 99 63 72
+
+66 54 87  7 98
+55 45 62 38 99
+13 23 76 30  3
+75 68  5 51 46
+ 0 60 71 70 41
+
+22 77 65 72 27
+88  9 25 44  0
+61  6 46 41 26
+74 78 20 86 87
+70 81  4  5 48
+
+41 51  8 64 50
+96 40 45 85 53
+18 86 24 29 27
+90 11 39 82 88
+12 56 54 87 59
+
+90 79 64 77 78
+97 12 72 27 86
+32 56 33 18 46
+95  5 51  6 80
+34 38 42 35 52
+
+66 10 82 90 19
+38 69 71 77 72
+61  9 98 86 93
+56  7 88 28 47
+22 96 21 52 64
+
+91 82 25 93 69
+95 79 84 35 90
+48  0 28 41 83
+23 55 88 71 65
+97 19 67 31 59
+
+47 60 65 11 85
+97 36 64 96 70
+82 84 76 89 44
+67 26 28 21 41
+63 54 94 10 34
+
+24 19 78  4 69
+52 38  7 58 21
+20 23 10 91 42
+44 36 25 45 49
+94 51 98 99 27
+
+67 25 54 28 71
+ 9 14 89 91 46
+65  1 55 88 19
+59 45 26 84 73
+83 62 50 42 97
+
+58 51 29 60 94
+34 79 39 19 91
+ 9 81 93 35 70
+ 4 23 80 33 75
+73 69  7 49 59
+
+44 83 20 24 56
+41 50 77 55 10
+79 49 67 99 16
+36 57 33 15 98
+40 76  4 53 39
+
+59 92 67  6 80
+64 90 15 40  7
+36 96 62 25 32
+44 91 52 43 19
+ 5  2 51 88 87
+
+ 4 97 70 78 59
+90 43 62 50 41
+61 64  2 91 49
+19 82 85 30 73
+15 51 36 11 34
+
+97  7 86 64 40
+15 46 84  0 58
+54 87 73 93 20
+48 94 32  4 77
+13 85 72 50 36
+
+68 54 94 71 83
+81 53 33 12 58
+22 67 52 21 25
+79 90 59 92 41
+29 11 76 98 85
+
+10 25 64  3 83
+21 87 97 78  7
+44 71 48 22 74
+80 72 90 29 63
+ 1 24 32 84 13
+
+25 28 19 65 24
+98 32  4  6 99
+ 7  0 27 37 35
+72 11  1 76 73
+49 85 83 93 14
+
+78 91 50 45 29
+35 27 18 48 87
+ 3 56 60 99 64
+84 61 15 77 40
+58 39 19  0 92
+
+98 38 88 43 39
+48 93  4 52 66
+57 99 83 55 25
+91 35 42 12 23
+40 15 81 94 77
+
+85 28 95 76 78
+39 66 18 47 49
+32 77 34 12 58
+69 15 45  6 41
+ 3 51 25 40 63
+
+58 97 10  5 57
+47 86 24 78 98
+89 25 39 73 83
+11 15 99 68 66
+84 70 61 76 30
+
+67 40 29 75 90
+71 31 41 37 52
+61  0 86 84 94
+25 96  9 21  6
+39 62 14  1 81
+
+15 65 47 63 94
+82 21 32 38 67
+12 20 30 91 68
+16 79  4 28 45
+ 1 70 84 49 78
+
+80 21 39 92 71
+48  8 87  0 38
+74  4 52 23 98
+53 89 61 30 46
+29 10 64 49  5
+
+40  2 62 39 51
+ 4 24 19 73 75
+86 14 97 91 11
+43  7 77 71 28
+32 63  6 20  8
+
+90 57 28 47 23
+10 41 77 52 31
+45 18 55 80 49
+76 50 16 96 81
+91 75 93 68 58
+
+63 87 12 16 60
+36 52 94 39 91
+67 56 24 18 26
+73 80 46  1 84
+30 74  6 61 75
+
+98 32 56 51 44
+58 78 71 74 26
+55 45 83 10 30
+54 47 93 62 23
+15 67 53 21 49
+
+59 93 49 65 42
+ 9 74 58 52 18
+ 1 47 71 25 68
+45 92 67 60 73
+97 63 61 34 36
+
+73 74  6 68 40
+76 85  1 26 91
+90 94 39 92 17
+80 51 20 77 67
+54 88 21 57 83
+
+14 52 70 30 32
+60 69 75 10 24
+65 40 72 71 58
+80 73 84 96  4
+62  9 28 41 36
+
+56  2 83  9 50
+75 42  5  3 72
+73 28 34 76 38
+49 33 30 80 46
+37 77 55 45 74
+
+40 69 31 88  8
+58 27 78 26 95
+73 86  1 34 79
+12 83  2 75 92
+ 0 48 63 17 65
+
+ 3 87 59 76 24
+90 10 44 28 21
+83 19 77 86 51
+81 88 42 94 15
+27 78 92 34 30
+
+44 23 83 22 87
+75 53 91 93 89
+88 40 56 46 37
+ 0  4 80 24  7
+97 72 96 12 68
+
+40 45 61 84 31
+85 12 27 82 50
+ 4 49 33  6 44
+51 36 15  0 14
+68 77 64 11 79
+
+31 79 50 63 59
+13  4  6 54  7
+86 30 41 68 34
+16 35 48 11 70
+84  8 81 65 74
+
+75 33 21 60 57
+ 7 86 82 18 68
+40 91  0 28 38
+90 36 92 94 55
+95 88 85 62 25
+
+ 7  5 75 36 74
+40 37 58 92 93
+46 68 24 98 34
+32 88 67 62 53
+83 84 90 31 63
+
+17 24 25 93 37
+16 36 59 81 41
+99 51 12 77 98
+80 32 28 18 39
+44 85 38 64 73
+
+83 18 86 33 61
+21 88 94 62 67
+40 25 97 27 73
+71 90 63 87  6
+16  7 36 92 69
+
+69 67 35 24 84
+79 44 66 37 75
+ 0 73 53 80 15
+74 20 32 12 60
+36 22 29 85 82
+
+49 72 69 33 10
+45 81 43  0 22
+12 76  5 29 52
+82 40 42 63 85
+ 1 34 32 66 15
+
+82 41 16 67 23
+30 84 25 88 48
+75 71 43  0  2
+35  3 68 26 50
+64 24  8 89 98
+
+61 23 63 51 46
+21 59 99 97 91
+60 34 42 26 31
+12 64 38 96 24
+ 5 13 90 37 94
+
+97  0 20 61 96
+92 39 43 57 64
+87 52 16 85 45
+60 41 86  6 53
+75 10 24 21 37
+
+37 92  1 46 51
+33  5 88 47 19
+ 0 35  2 69 72
+67 56 49 20 63
+25  7 41 65 91
+
+17 69 67 77 23
+16 79 81 51 57
+12 59 49 76 91
+ 1 55 41 87 38
+85 98 37 71  5
+
+90 11 18 59 31
+61  1 28  2 27
+98 56 95 63 93
+24 83 36 85 72
+64 97 69 20 10
+
+80 58 95  5 74
+ 6 20 13 59 63
+ 8 62 55 53 41
+48 70 28 10 47
+18  4 76 45 34
+
+39 30 64 24 14
+42  6  0 33 57
+35  7 68 62 32
+70 65 44 82 31
+98 93 50 53 61
+
+14  9 98 70 45
+27 86  6 21 76
+56 19 26 28 43
+78 87 58 89 97
+72 49 54 67  8
+
+21 22 51 62 59
+38 64 30 40 94
+56 57 28 19 17
+50 32 83 97 48
+41 54 75 66  5
+
+ 4 21 16 91 75
+17 87 68 38 66
+92 11 39 31 45
+58 41 96 85 98
+99 44 86 15 26
+
+76 61 82 96 49
+98 10 93 22 56
+66 78 21 73 67
+ 3 39 15 85 87
+48 91 45 70 53
+
+17  6  8 46 30
+81 53 76 21 63
+20 47 75 67 59
+69 58  5 62 92
+ 7  9 93 43 70
+
+17 50 24 71 28
+30 31 37 48 80
+34 62 19 57 41
+88 49 51 93 98
+87 78 55 94 46
+
+93 87 54 64 29
+81 66 35 43 25
+74 86 95  2 92
+42 94 45 51 17
+23 28 16 37 80
+
+68 15 25 10 32
+60 51 45 38  4
+64 47 50 12 14
+86 61 31 67  2
+18 28 55 59 87
+
+95 84 19 48  0
+12 22 97  6 89
+93 70 71 35 88
+49 18 37 58 36
+43 63 23 68 17
+
+29 15 91 37 45
+ 3 98 33 73 39
+31 13 94 90 96
+81 87 78 93 42
+69 75 14  2 27
+
+80 30 69 34  1
+59 23 20 85 31
+48 71 16 96 92
+66 99 39 53 52
+91 67 70 77 19
+
+90 16 52 74  2
+41 39 95 59  1
+46 84 64 93 14
+92 48 25 28 98
+94 81 20 27 32
+
+22 89 48 77 37
+54 59 30 71 38
+80 53  3 27 32
+25 23 35 79 91
+15 29  7 93  9
+
+60 38 37  5 96
+51 77 28 63 80
+45 67 87 20 34
+56 26 61 85 82
+19 71 27 41 54
+
+27 71 18 16 40
+88  3 61 74 52
+80 44 34 10 36
+15  2  1  4 11
+84 50 72 39 89
+
+42 74 45  1 35
+ 0 63 38 12 85
+18  2 13 87 30
+44 67 68 41 70
+47 82 98 48 69
+
+34 78 38 27  9
+91 47 69 51 73
+67 59 45 15 21
+30 24 89  5  2
+36 22 87 68 76
+
+18 68 58 95 29
+72 24 70 47 79
+35 63 20 71 93
+60 59 34 49 81
+22 98 57 53 76
+
+46 40 82 45  0
+ 2 22 28 38 97
+11 16 78 95 86
+80 85 83 17 67
+63  1 26 25 64
+
+49 81 31  9 60
+33 15 29 38 66
+90 43  2 39 89
+24 40 63 36 91
+45 68 62 87 12
+
+36 54 76 33  9
+60  7 25 96 61
+17  4  1 62 31
+93 83 79 30 73
+88 75 13  6 24
+
+47 96  5 82 34
+76 67 30 15  2
+52 43 16 92 77
+58 13 18 78 84
+39 41 74 46 91
+
+15 45 99 42  5
+41 61 58 14 55
+24 76 46 91 78
+52 56 81 92 59
+ 4  0 63 95 29
+
+75 53  8 76 33
+82 60  7 32 97
+90 40 56 51  1
+15 48  4 41 71
+13 69 46 65 52
+
+77 93 27 42 20
+ 0 68 31 51 52
+ 3 83 56  4 38
+54 65 86 72 16
+35 34  2 99 64
+
+ 0 47 54 49 73
+11 61 18 69 16
+75 90  3 65 93
+22 57 84 96  8
+92  4  5  2 35
+
+91 23 41 85 88
+68 28  9 70 74
+51 71 42 79  7
+61 77 57 82 18
+16  4 32 80 38
+
+99 87 92 63 24
+51 64 22  9 94
+48  5  7 83 19
+11 27 46  2 17
+33 60 36 30 32
+
+91 20 80 10 81
+55 78  8 67  7
+37 76 31 16 49
+30 33 63 68 28
+50 35 40 74 77
+
+27 39 23 34 94
+51 18 60  8 98
+28 75  4 85 12
+96  2 15 29 88
+46 35 32 79 50
+
+91 62  4 40 11
+92 47 56  5  3
+85 75 55  8 12
+25 48 13 31 21
+46 54 95 26 80
+
+ 5 54 87 34  3
+96 12 67  6 14
+ 1 43 92 35 49
+31 72 65 85  2
+75 81 26 28  4
+
+81 38  3 64 71
+69 53 19  1 67
+17 63 73 10 85
+37 15 91 20 62
+ 0 35 47  8 43
diff --git a/day04.bqn b/day04.bqn
new file mode 100644
index 0000000..8f1cc04
--- /dev/null
+++ b/day04.bqn
@@ -0,0 +1,13 @@
+str←•Import"bqn-libs/strings.bqn"
+
+draws‿cards ← (⊑⋈1⊸↓) str.lf‿str.lf str.Split •FChars"day04"
+draws ↩ > •BQN¨ ',' str.Split draws
+cards ↩ >> {{•BQN¨ (⊢ /˜ (1⌊≠)¨) ' '⊸str.Split 𝕩}¨ str.lf⊸str.Split 𝕩}¨ ¯1↓cards
+
+Cross ← { ¯1+(1+𝕩)×𝕩≠𝕨 }
+Won ← { ∨´1=(×˝-𝕩)∾(×˝⍉-𝕩) }
+
+winners ← {⊐⟜1 Won¨ (<𝕩) Cross˜` draws}˘ cards
+
+•Out (⌊´winners)⊑draws×+´+˝0⌈((⊑⍋winners)⊏cards) Cross´ (1+⌊´winners)↑draws
+•Out (⌈´winners)⊑draws×+´+˝0⌈((⊑⍒winners)⊏cards) Cross´ (1+⌈´winners)↑draws
diff --git a/day04.clj b/day04.clj
new file mode 100644
index 0000000..316fcef
--- /dev/null
+++ b/day04.clj
@@ -0,0 +1,56 @@
+(ns org.vuxu.aoc2021.day04
+  (:require [clojure.string :as str]))
+
+(let [[draws & cards] (str/split (slurp "day04") #"\n\n")]
+  (def draws (->> (str/split draws #",")
+                  (map parse-long)))
+  (def cards (for [card cards]
+               (->> card
+                    str/split-lines
+                    (map str/trim)
+                    (mapv #(->> (str/split % #" +")
+                                (mapv parse-long)))))))
+
+(defn find-in [number card]
+  (first (for [[lineno line] (map-indexed vector card)
+               [rowno cand] (map-indexed vector line)
+               :when (= cand number)]
+           [lineno rowno])))
+
+(defn cross [number card]
+  (if-let [pos (find-in number card)]
+    (update-in card pos (constantly true))
+    card))
+
+(defn won? [card]
+  (when (or (some (partial every? true?) card)
+            (some (partial every? true?) (apply mapv vector card)))
+    card))
+
+(defn score [card draw]
+  (->> card
+       flatten
+       (filter number?)
+       (apply +)
+       (* draw)))
+
+(def part1
+  (reduce (fn [cards draw]
+            (let [new-cards (map (partial cross draw) cards)]
+              (if-let [winner (some won? new-cards)]
+                (reduced (score winner draw))
+                new-cards)))
+          cards
+          draws))
+;; => 33348
+
+(def part2
+  (reduce (fn [cards draw]
+            (let [new-cards (map (partial cross draw) cards)
+                  remaining-cards (filter (complement won?) new-cards)]
+              (if (empty? remaining-cards)  ; assume only one last winner
+                (reduced (score (first new-cards) draw))
+                remaining-cards)))
+          cards
+          draws))
+;; => 8112