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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import gleam/int | ||
| import gleam/list | ||
| import gleam/string | ||
|
|
||
| pub fn parse(input: String) -> List(#(Int, List(Int))) { | ||
| use line <- list.map(string.split(input, "\n")) | ||
| let assert Ok(#(test_val, args)) = string.split_once(line, ": ") | ||
| let assert Ok(test_val) = int.parse(test_val) | ||
| let assert Ok(vals) = list.try_map(string.split(args, " "), int.parse) | ||
| #(test_val, vals) | ||
| } | ||
|
|
||
| pub fn pt_1(input: List(#(Int, List(Int)))) -> Int { | ||
| use acc, #(test_val, args) <- list.fold(input, 0) | ||
| let assert [first, ..rest] = args | ||
| case do(rest, first, test_val, [int.add, int.multiply]) { | ||
| True -> acc + test_val | ||
| False -> acc | ||
| } | ||
| } | ||
|
|
||
| pub fn pt_2(input: List(#(Int, List(Int)))) { | ||
| use acc, #(test_val, args) <- list.fold(input, 0) | ||
| let assert [first, ..rest] = args | ||
| case do(rest, first, test_val, [int.add, int.multiply, concat]) { | ||
| True -> acc + test_val | ||
| False -> acc | ||
| } | ||
| } | ||
|
|
||
| fn concat(front: Int, back: Int) -> Int { | ||
| let assert Ok(front) = int.digits(front, 10) | ||
| let assert Ok(back) = int.digits(back, 10) | ||
| let assert Ok(smushed) = list.flatten([front, back]) |> int.undigits(10) | ||
| smushed | ||
| } | ||
|
|
||
| fn do(input, acc, test_val, ops) -> Bool { | ||
| case input { | ||
| [] -> acc == test_val | ||
| [x, ..xs] -> list.any(ops, fn(op) { do(xs, op(acc, x), test_val, ops) }) | ||
| } | ||
| } |