192 day19 part2

○ Planned This feature is planned but not yet implemented.

OWED: AoC 2015 day 19 part 2 (fewest steps from e).

Failure Output

error[PARSE003]: single continuation branch 'steps' carrying a payload is a one-variant tag union — declare the single output as a bare return instead: `-> i64`
  --> tests/regression/810_AOC_2015/810_192_day19_part2/input.k:11:1
    |
 11 | pub tor fabricate { molecule: string }
    | ^

Code

// AoC 2015 Day 19 Part 2 — fewest steps to fabricate the molecule from e
// (statement: HOH → 3 steps). Greedy reverse-replacement leaf.
// Ledger: search ← host; rule table ← collections.

import std/io
import std/fs
import std/regex

pub tor add-rule { line: string }

pub tor fabricate { molecule: string }
| steps i64

std/fs:read-lines(path: "tests/regression/810_AOC_2015/810_192_day19_part2/input.txt")
! line l |> std/regex:match(l)
    | `[A-Za-z]+ => [A-Za-z]+` _ |> add-rule(line: l)
    | `[A-Za-z]+` _ |> fabricate(molecule: l)
        | steps n |> std/io:print.ln("{{ n:d }}")
    | no-match |> _
| done _ |> _
| failed e |> std/io:print.ln("FAILED {{ e:s }}")

input.k

Supporting Files

e => H
e => O
H => HO
H => OH
O => HH

HOH

input.txt

Expected output

Test Configuration

MUST_RUN

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