updates + improvements #4
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Anton-4
commented
Nov 30, 2024
| @@ -32,14 +32,12 @@ SOLVING PART 2: 209ms | |||
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| ``` | |||
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| This package assumes you have a [roc-lang/basic-cli](https://github.com/roc-lang/basic-cli) app (although that is not strictly necessary). | |||
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This may confuse the new people
Anton-4
commented
Nov 30, 2024
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| Example implementation: | ||
| ``` | ||
| part1 : Str -> Result Str Str | ||
| part1 = \input -> | ||
| numbers = parseNumbers input | ||
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| combined = | ||
| List.joinMap numbers \x -> | ||
| List.map numbers \y -> | ||
| { x, y, sum: x + y, mul: x * y } | ||
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| when List.keepIf combined \c -> c.sum == 2020 is | ||
| [first, ..] -> Ok "$(Num.toStr first.x) * $(Num.toStr first.y) = $(Num.toStr first.mul)" | ||
| _ -> Err "expected at least one pair to have sum of 2020" | ||
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| part2 : Str -> Result Str Str | ||
| part2 = \input -> | ||
| numbers = parseNumbers input | ||
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| combined = | ||
| List.joinMap numbers \x -> | ||
| List.joinMap numbers \y -> | ||
| List.map numbers \z -> | ||
| { x, y, z, sum: x + y + z, mul: x * y * z } | ||
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| when List.keepIf combined \c -> c.sum == 2020 is | ||
| [first, ..] -> Ok "$(Num.toStr first.x) * $(Num.toStr first.y) * $(Num.toStr first.z) = $(Num.toStr first.mul)" | ||
| _ -> Err "expected at least one triple to have sum of 2020" | ||
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| parseNumbers = \input -> input |> Str.splitOn "\n" |> List.keepOks Str.toU64 | ||
| ``` |
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This seems helpful for first timers
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