master
Dustin Swan 3 years ago
parent 01d387264c
commit e7a329d126

@ -0,0 +1,103 @@
#load "str.cma";;
(* Common util. Should probably put this in a module or something.. *)
let get_one_line file =
try Some (input_line file) with
End_of_file -> None
let get_lines file =
let rec input lines =
match get_one_line file with
Some line -> input (line :: lines)
| None -> List.rev lines
in input []
let read_file file =
let channel = open_in(file) in
get_lines channel
let explode s = (* convert a string to a list of chars *)
let rec exp i l =
if i < 0 then l else exp (i - 1) (s.[i] :: l) in
exp (String.length s - 1) []
let implode l = String.of_seq (List.to_seq l)
let (<<) f g x = f(g(x))
let (>>) f g x = g(f(x))
let rec find_idx nth x = function (* find nth index of x in a list *)
| [] -> raise (Failure "Not Found")
| h :: t ->
if x = h
then if nth = 0 then 0 else 1 + find_idx (nth-1) x t
else 1 + find_idx nth x t
let rec take n l = (* take the first n elements *)
match n with
| 0 -> []
| n ->
match l with
| [] -> []
| x :: xs -> x :: (take (n-1) xs)
let rec drop n l = (* drop the first n elemnts *)
match n with
| 0 -> l
| n -> drop (n-1) @@ List.tl l
let string_of_char = String.make 1
(* --- *)
type rule = Char of char | List of int list | Pair of rule * rule
type rule' = Char' of char | List' of rule' list | Pair' of rule' * rule' (* deref'd *)
let rec string_of_rule' = function
| Char' x -> string_of_char x
| List' l -> List.fold_left (fun acc x -> acc ^ (string_of_rule' x)) "" l
| Pair' (a, b) -> "\\(" ^ (string_of_rule' a) ^ "\\|" ^ (string_of_rule' b) ^ "\\)"
let rec rule_of_string str =
let str' = String.trim str in
if String.contains str' '|'
then let [l; r] = String.split_on_char '|' str' in
Pair (rule_of_string l, rule_of_string r)
else if String.contains str' '"' then
Char (String.get str' 1)
else
List (List.map int_of_string (String.split_on_char ' ' str'))
let parse_rule_line line =
let [key; rule_string] = String.split_on_char ':' line in
let rule = rule_of_string rule_string in
(int_of_string key, rule)
let read_chunks lines =
let blank_idx = find_idx 0 "" lines in
let rules = take blank_idx lines |> List.map parse_rule_line in
let messages = drop blank_idx lines in
(rules, messages)
let rec deref rules depth rule =
if depth > 20 (* CHEATER MODE *)
then List' []
else
match rule with
| Char x -> Char' x
| Pair (a, b) -> Pair' (deref rules (depth+1) a, deref rules (depth+1) b)
| List l -> List' (List.map (fun key ->
let rule = List.assoc key rules in
deref rules depth rule) l)
let () =
let (rules, messages) = read_file "day19.txt" |> read_chunks in
let rule0 = deref rules 0 (List.assoc 0 rules) in
print_string (string_of_rule' rule0);
let rule0_str = string_of_rule' rule0 in
let r = Str.regexp ("^" ^ rule0_str ^ "$") in
let good = List.filter (fun m -> Str.string_match r m 0) messages in
Printf.printf "\nnum good: %i" (List.length good);

@ -0,0 +1,514 @@
76: 125 57 | 102 58
6: 57 30 | 58 123
62: 58 58 | 57 58
90: 122 57 | 87 58
82: 57 58 | 57 57
118: 102 57 | 125 58
7: 103 57 | 77 58
130: 27 58 | 53 57
101: 58 107 | 57 117
31: 55 58 | 81 57
114: 123 57 | 62 58
48: 103 58 | 94 57
105: 58 113 | 57 20
100: 57 88 | 58 35
127: 121 54
80: 54 58 | 72 57
19: 5 58 | 102 57
28: 95 57 | 23 58
43: 30 58 | 123 57
119: 58 71 | 57 33
44: 94 58 | 24 57
72: 58 58
35: 109 57 | 106 58
85: 127 58 | 132 57
25: 57 30 | 58 102
42: 119 58 | 111 57
86: 58 5 | 57 125
54: 57 121 | 58 57
88: 58 97 | 57 129
71: 110 57 | 46 58
67: 94 57 | 125 58
12: 5 58 | 62 57
112: 58 70 | 57 69
123: 58 57
52: 10 58 | 48 57
122: 14 58 | 68 57
68: 82 58 | 94 57
23: 57 54 | 58 24
64: 58 54 | 57 72
89: 41 57 | 28 58
132: 103 58 | 47 57
115: 58 133 | 57 49
116: 58 103 | 57 77
15: 77 57 | 24 58
92: 58 62 | 57 30
4: 58 99 | 57 75
59: 57 72 | 58 102
26: 52 57 | 108 58
58: "b"
14: 58 103 | 57 30
47: 57 57 | 58 58
37: 58 82 | 57 125
32: 125 57 | 123 58
95: 123 58 | 123 57
83: 57 36 | 58 79
128: 65 58 | 32 57
125: 57 58 | 58 57
11: 42 31 | 42 11 31
65: 62 58
75: 58 1 | 57 67
30: 57 57
102: 121 121
0: 8 11
111: 50 57 | 93 58
113: 57 126 | 58 40
129: 25 58 | 29 57
45: 5 57 | 94 58
104: 24 121
24: 58 121 | 57 58
49: 57 12 | 58 6
17: 57 123 | 58 54
3: 74 57 | 131 58
94: 57 57 | 58 57
98: 57 86 | 58 2
13: 34 57 | 78 58
21: 57 98 | 58 120
107: 86 58 | 17 57
57: "a"
9: 57 112 | 58 90
40: 57 104 | 58 45
38: 58 94 | 57 30
106: 57 63 | 58 76
97: 57 60 | 58 116
96: 57 77 | 58 72
41: 63 57 | 19 58
63: 24 58 | 62 57
78: 57 47 | 58 103
131: 30 57 | 62 58
77: 57 58
55: 57 9 | 58 100
69: 96 58 | 43 57
36: 72 57 | 123 58
33: 58 101 | 57 26
53: 58 47 | 57 94
70: 38 58 | 37 57
20: 84 57 | 13 58
2: 57 123 | 58 72
84: 58 16 | 57 66
34: 58 5 | 57 62
56: 85 58 | 3 57
126: 15 57 | 59 58
87: 57 80 | 58 51
93: 58 61 | 57 4
99: 58 92 | 57 16
110: 57 83 | 58 124
10: 57 24 | 58 62
27: 57 30
29: 54 57 | 103 58
103: 57 121 | 58 58
46: 57 18 | 58 130
50: 89 57 | 115 58
79: 57 5 | 58 103
1: 123 58 | 77 57
61: 57 128 | 58 39
109: 116 58 | 96 57
66: 82 57 | 47 58
117: 53 58 | 91 57
124: 118 57 | 7 58
22: 77 57 | 125 58
39: 58 66 | 57 44
51: 58 77 | 57 47
73: 57 56 | 58 21
60: 77 57 | 82 58
91: 24 58 | 123 57
16: 30 58 | 82 57
120: 22 57 | 64 58
81: 57 105 | 58 73
133: 58 114 | 57 44
18: 57 60 | 58 22
8: 42 | 42 8
108: 58 10 | 57 118
74: 30 57 | 77 58
121: 58 | 57
5: 57 57 | 58 121
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