From 01d387264c12bf9f251f0fa27673084bf580fe75 Mon Sep 17 00:00:00 2001 From: Dustin Swan Date: Sun, 20 Dec 2020 01:29:41 -0500 Subject: [PATCH] day18 --- day18.1.ml | 90 +++++++++++++ day18.2.ml | 106 +++++++++++++++ day18.txt | 373 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 569 insertions(+) create mode 100644 day18.1.ml create mode 100644 day18.2.ml create mode 100644 day18.txt diff --git a/day18.1.ml b/day18.1.ml new file mode 100644 index 0000000..4e62f91 --- /dev/null +++ b/day18.1.ml @@ -0,0 +1,90 @@ +(* 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 (<<) f g x = f(g(x)) +let (>>) f g x = g(f(x)) + +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 c2i = String.make 1 >> int_of_string + +(* --- *) + +type exp = Add of exp * exp | Mul of exp * exp | Num of int + +let rec string_of_exp = function + | Num x -> string_of_int x + | Mul (a, b) -> Printf.sprintf "(%s * %s)" (string_of_exp a) (string_of_exp b) + | Add (a, b) -> Printf.sprintf "(%s + %s)" (string_of_exp a) (string_of_exp b) + +let print_exp = print_string << string_of_exp +let print_exps = List.iter print_exp + +let rec find_matching_paren count (x::xs) = + match x with + | '(' -> if count = 0 then 0 else 1 + find_matching_paren (count-1) xs + | ')' -> 1 + find_matching_paren (count+1) xs + | n -> 1 + find_matching_paren count xs + +let read_exp line = + let line' = line + |> explode + |> List.filter (fun x -> x != ' ') + |> List.rev + in + + let rec go stack = function + | [] -> List.hd stack + | '+' :: xs -> Add (List.hd stack, (go (List.tl stack) xs)) + | '*' :: xs -> Mul (List.hd stack, (go (List.tl stack) xs)) + | ')' :: xs -> + let matching = 1 + find_matching_paren 0 xs in + let sub = take matching xs in + let rest = drop matching xs in + go ((go [] sub)::stack) rest + | '(' :: xs -> List.hd stack + | num :: xs -> go ((Num (c2i num)) :: stack) xs + in + + go [] line' + +let rec eval = function + | Num a -> a + | Add (a, b) -> (eval a) + (eval b) + | Mul (a, b) -> (eval a) * (eval b) + +let () = + let exps = read_file "day18.txt" |> List.map read_exp in + + let values = List.map eval exps in + let sum = List.fold_left (+) 0 values in + print_int sum; diff --git a/day18.2.ml b/day18.2.ml new file mode 100644 index 0000000..2217f7e --- /dev/null +++ b/day18.2.ml @@ -0,0 +1,106 @@ +(* 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 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 c2i = String.make 1 >> int_of_string + +(* --- *) + +type exp = Add of exp * exp | Mul of exp * exp | Num of int +type op = Plus | Mult + +let rec string_of_exp = function + | Num x -> string_of_int x + | Mul (a, b) -> Printf.sprintf "(%s * %s)" (string_of_exp a) (string_of_exp b) + | Add (a, b) -> Printf.sprintf "(%s + %s)" (string_of_exp a) (string_of_exp b) + +let print_exp = print_string << string_of_exp +let print_exps = List.iter print_exp + +let string_of_op = function | Plus -> "Plus" | Mult -> "Mult" +let print_op = print_string << string_of_op +let print_ops = List.iter print_op + +let rec find_matching_paren count (x::xs) = (* find matching closing paren *) + match x with + | ')' -> if count = 0 then 0 else 1 + find_matching_paren (count-1) xs + | '(' -> 1 + find_matching_paren (count+1) xs + | n -> 1 + find_matching_paren count xs + +let rec run_stack exps ops = + if List.length exps = 1 + then List.hd exps + else + let (l :: r :: exps') = exps in + let (op :: ops') = ops in + match op with + | Plus -> run_stack ((Add (l, r)) :: exps') ops' + | Mult -> run_stack ((Mul (l, r)) :: exps') ops' + +let read_exp line = + let line' = line + |> explode + |> List.filter (fun x -> x != ' ') + in + + let rec go exps ops = function + | [] -> run_stack exps ops (* end of our string *) + | '*' :: xs -> Mul (run_stack exps ops, go [] [] xs) (* "split" on Mul *) + | '+' :: xs -> go exps (Plus :: ops) xs + | '(' :: xs -> + let matching = 1 + find_matching_paren 0 xs in + let sub = take matching xs in + let rest = drop matching xs in + go ((go [] [] sub)::exps) ops rest + | ')' :: xs -> go exps ops xs + | num :: xs -> go ((Num (c2i num)) :: exps) ops xs + in + + go [] [] line' + +let rec eval = function + | Num a -> a + | Add (a, b) -> (eval a) + (eval b) + | Mul (a, b) -> (eval a) * (eval b) + +let () = + let exps = read_file "day18.txt" |> List.map read_exp in + + let values = List.map eval exps in + let sum = List.fold_left (+) 0 values in + print_int sum; diff --git a/day18.txt b/day18.txt new file mode 100644 index 0000000..a2341bf --- /dev/null +++ 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