28 lines
653 B
Scala
28 lines
653 B
Scala
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object day03 {
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def main(args: Array[String]): Unit = {
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val numbers = io.Source.stdin
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.getLines()
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.map(ln => ln.chars.map(_ - '0').toArray)
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.toArray
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var occurences = Array.fill(numbers(0).length)(0)
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for (number <- numbers) {
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for ((bit, i) <- number.zipWithIndex)
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occurences(i) += bit
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}
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var gamma = 0
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var epsilon = 0
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for ((freq, i) <- occurences.zipWithIndex) {
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val shifted = 1 << occurences.length - 1 >> i
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if (freq > (numbers.length / 2))
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gamma |= shifted
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else
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epsilon |= shifted
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}
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val part1 = gamma * epsilon
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println(s"part1: $part1")
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}
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}
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