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perf(day7): small but easy pruning

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This commit is contained in:
John Costa
2024-12-07 11:20:56 +00:00
parent 780816fda9
commit ee88542095
1 changed files with 4 additions and 3 deletions
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7
AdventOfCode2024/lib/day_07.ml
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@ -37,15 +37,16 @@ let attempt_solve_part2 { equals; numbers } =
match numbers with
| head :: [] -> [ head ]
| head :: tail ->
let plus = List.map (fun i -> i + head) (loop tail) in
let times = List.map (fun i -> i * head) (loop tail) in
let below_solution = List.filter (fun i -> i <= equals) (loop tail) in
let plus = List.map (fun i -> i + head) below_solution in
let times = List.map (fun i -> i * head) below_solution in
let concat =
List.map
(fun i ->
let i_string = string_of_int i in
let head_string = string_of_int head in
int_of_string (i_string ^ head_string))
(loop tail)
below_solution
in
plus @ times @ concat
| _ -> raise (Invalid_argument "")