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import java.io.FileOutputStream | |
import scala.io.Source | |
/** | |
* 풀에 물을 채우는 가장 좋은 방법은 모든 관을 하나의 관처럼 생각하고 그 관을 들이 붓는것. | |
* 하지만 그 경우 온도가 틀릴수 있다. | |
* | |
* 온도가 틀릴 경우, 목표 온도를 기준으로 두개 의 리스트를 만든다. | |
* 열량 호율 측면에서. | |
* 온도가 낮을 경우, 낮은 묶음 중 가장 낮은 온도의 관부터 잠근다. | |
* 온도가 높을 경우, 높은 묶음 중에서 가장 높은 온도의 관부터 잠궈나간다. | |
*/ | |
object KiddiePool { | |
val INPUT = "B-large-practice.in" | |
val OUTPUT = INPUT.takeWhile(_ != '.') + ".out" | |
val isConsole = false | |
/** | |
* | |
* @param r rate of water | |
* @param c temperature | |
*/ | |
case class Pipe(r: Double, c: Double) { | |
def merge(pipe: Pipe) = { | |
val volume = r + pipe.r | |
Pipe(volume, (c * r + pipe.c * pipe.r) / volume) | |
} | |
} | |
def main(args: Array[String]): Unit = { | |
val itr = Source.fromFile(INPUT).getLines() | |
val stream = if (isConsole) Console.out else new FileOutputStream(OUTPUT) | |
try { | |
Console.withOut(stream) { | |
val sets = itr.next().toInt | |
(1 to sets).foreach { set => | |
val Array(pipes, v, x) = itr.next().split(' ').map(_.toDouble) | |
val ps = (1 to pipes.toInt).map { _ => | |
val Array(r, c) = itr.next().split(' ').map(_.toDouble) | |
Pipe(r, c) | |
} | |
println(f"Case #$set: ${minimumSeconds(ps.toList, v, x)}") | |
} | |
} | |
} finally { | |
stream.flush() | |
if (!isConsole) stream.close() | |
} | |
} | |
/** | |
* | |
* @param ps | |
* @param V Traget Volume | |
* @param X Target Temperature | |
* @return | |
*/ | |
def minimumSeconds(ps: List[Pipe], V: Double, X: Double) = { | |
def fastenPipes(cList: List[Pipe], opened: Pipe, comp: (Double) => Boolean, currentTemp: Double): Option[Double] = cList match { | |
case x :: xs => | |
val Pipe(size, adjustedT) = mergePipes(opened :: xs) | |
if (Math.abs(adjustedT - X) < 0.0000000001) { | |
Some(V / size) | |
} else if (comp(adjustedT)) { | |
//x 를 배제해도 여전히 뜨겁거나 차가운 경우, | |
fastenPipes(xs, opened, comp, adjustedT) | |
} else { | |
/** | |
* T = ((V0*X0)+(V1*X1)) / (V0 + V1) | |
* -> X = ((size * adjustedT) + (x.c * newRate)) / (size + newRate) | |
* -> X*size + X*newRate = size * adjustedT + x.c * newRate | |
* -> x.c * newRate - X*newRate = X*size - size * adjustedT | |
* -> (x.c - X) * newRate = X*size - size * adjustedT | |
* -> newRate = (X*size - size * adjustedT) / (x.C - X) | |
*/ | |
val rate = (X - adjustedT) * size / (x.c - X) | |
// if(rate.isNaN()) { | |
// println("weird - nan", adjustedT, opened, xs) | |
// None | |
// } else { | |
Some(V / (size + rate)) | |
// } | |
} | |
} | |
val mergedPipes = mergePipes(ps) | |
val currentTemperature = mergedPipes.c | |
val ret = if (Math.abs(currentTemperature - X) < 0.0000000001) { | |
Some(V / mergedPipes.r) | |
} else { | |
val sortedList = ps.sortBy(_.c) | |
val (lowerSources, others) = sortedList.span(_.c < X) | |
val (neutralSource, higherSource) = others.span(_.c == X) | |
if (neutralSource.isEmpty && (higherSource.isEmpty || lowerSources.isEmpty)) { //Impossible | |
None | |
} else { | |
val (controlledPipes, openedPipe, func) = | |
if (currentTemperature > X) | |
(higherSource.reverse, mergePipes(lowerSources ++ neutralSource), (x: Double) => x > X) | |
else (lowerSources, mergePipes(higherSource ++ neutralSource), (x: Double) => x < X) | |
fastenPipes(controlledPipes, openedPipe, func, currentTemperature) | |
} | |
} | |
ret match { | |
case Some(d) => d.toString | |
case None => "IMPOSSIBLE" | |
} | |
} | |
def mergePipes(pipes: List[Pipe]) = (Pipe(0, 0) /: pipes)(_ merge _) | |
} |
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