Created
December 5, 2021 03:47
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| output application/json | |
| import fromBinary from dw::core::Numbers | |
| var inputData = readUrl("classpath://inputs/day3.txt", "text/plain") | |
| then (result) -> result splitBy "\n" | |
| var lines = inputData map flatten($ scan /./) | |
| var columns = sizeOf(lines[0]) - 1 | |
| var findMostCommon = (collection: Array, index: Number) -> | |
| using (entries = collection map $[index]) | |
| using (groups = entries groupBy $) | |
| if (sizeOf(groups.'0') > sizeOf(groups.'1')) | |
| '0' | |
| else if (sizeOf(groups.'0') < sizeOf(groups.'1')) | |
| '1' | |
| else | |
| '1' | |
| var findLeastCommon = (collection: Array, index: Number) -> | |
| using (entries = collection map $[index]) | |
| using (groups = entries groupBy $) | |
| if (sizeOf(groups.'0') > sizeOf(groups.'1')) | |
| '1' | |
| else if (sizeOf(groups.'0') < sizeOf(groups.'1')) | |
| '0' | |
| else | |
| '0' | |
| var findRatings = (candidates: Array, index: Number, target: String) -> | |
| candidates filter $[index] == target | |
| var initialAcc = { | |
| oxygen: lines, | |
| C02: lines | |
| } | |
| var ratings = (0 to columns) reduce ((column, acc = initialAcc) -> | |
| { | |
| oxygen: if (sizeOf(acc.oxygen) == 1) | |
| acc.oxygen | |
| else | |
| findRatings(acc.oxygen, column, findMostCommon(acc.oxygen, column)), | |
| C02: if (sizeOf(acc.C02) == 1) | |
| acc.C02 | |
| else | |
| findRatings(acc.C02, column, findLeastCommon(acc.C02, column)) | |
| } | |
| ) | |
| --- | |
| fromBinary(ratings.oxygen[0] joinBy "") * fromBinary(ratings.C02[0] joinBy "") |
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