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else Zero + + val gamma = input.transpose + .map(findMostCommonBit) + + val epsilon = gamma.map(_.flip()) + + val part1 = + Integer.parseInt(gamma.mkString, 2) * Integer.parseInt(epsilon.mkString, 2) + + println(s"Part 1: $part1") + + // Part 2 + + enum BitCriteria(val selectBitByCount: (Int, Int) => Bit): + case OxygenGeneratorRating + extends BitCriteria((onesCount, zerosCount) => + if (onesCount >= zerosCount) One else Zero + ) + case CO2ScrubberRating + extends BitCriteria((onesCount, zerosCount) => + if (onesCount < zerosCount) One else Zero + ) + + import BitCriteria._ + + def filterByBitCriteria( + filteredBitIndex: Int, + numbers: Array[Array[Bit]], + bitCriteria: BitCriteria + ): Array[Bit] = + val filteredBits = numbers.map(_(filteredBitIndex)) + val onesCount = filteredBits.count(_ == One) + val zeroesCount = filteredBits.count(_ == Zero) + val headToKeep = bitCriteria.selectBitByCount(onesCount, zeroesCount) + val filteredNumbers = numbers.filter(_(filteredBitIndex) == headToKeep) + + if (filteredNumbers.length == 1) + filteredNumbers.head + else + filterByBitCriteria(filteredBitIndex + 1, filteredNumbers, bitCriteria) + + val oxygenGeneratorRating = + Integer.parseInt( + filterByBitCriteria(0, input, OxygenGeneratorRating).mkString, + 2 + ) + val cO2ScrubberRating = + Integer.parseInt( + filterByBitCriteria(0, input, CO2ScrubberRating).mkString, + 2 + ) + + println(s"Part 2: ${oxygenGeneratorRating * cO2ScrubberRating}")