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AoC Day 3
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package aoc | |
object Problem03 extends App { | |
println( | |
Some( | |
scala.io.Source.fromFile("inputs/3.txt") | |
.getLines | |
.take(2) | |
.map(l => l.split(",").map(w => w(0) -> w.substring(1).toInt).toList) | |
.map( | |
_.scanLeft(((0, 0), (0, 0), 0, false, 0, (0, 0)))((s, m) => | |
Map('R' -> (1, 0), 'L' -> (-1, 0), 'U' -> (0, 1), 'D' -> (0, -1)) | |
.get(m._1) | |
.map(t => ( | |
s._2, | |
(s._2._1 + t._1 * m._2, s._2._2 + t._2 * m._2), | |
s._3 + m._2, | |
t._1 == 0, | |
if (t._1 == 0) s._2._1 else s._2._2, | |
Some( | |
if (t._1 == 0) (s._2._2, s._2._2 + m._2 * t._2) | |
else (s._2._1, s._2._1 + m._2 * t._1) | |
).map(p => if (p._1 > p._2) p.swap else p).get | |
)) | |
.getOrElse(sys.error(s"invalid character ${m._1}")) | |
).drop(1) | |
) | |
.sliding(2) | |
.map(l => l(0).flatMap(s => l(1).map(s -> _))) | |
.next | |
.filter(p => p._1._4 ^ p._2._4) | |
.map(p => if (p._1._4) p else p.swap) | |
.filter(p => p._1._5 >= p._2._6._1 && p._1._5 <= p._2._6._2 && p._2._5 >= p._1._6._1 && p._2._5 <= p._1._6._2) | |
.map(p => ( | |
Math.abs(p._1._5) + Math.abs(p._2._5), | |
p._1._3 + p._2._3 - Math.abs(p._1._5 - p._2._2._1) - Math.abs(p._2._5 - p._1._2._2) | |
)) | |
).map( m => | |
List[(Int, Int) => Int]( | |
(v, _) => v, | |
(_, v) => v, | |
).map(f => | |
m.map(v => f(v._1, v._2)).min | |
) | |
.zipWithIndex | |
.map(v => s"Part ${v._2 + 1}: ${v._1}") | |
.mkString("\n") | |
).get | |
) | |
} |
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