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// exercism.io - 첫 번 째 풀이

case class Matrix(matrix: List[List[Int]]) {
  def saddlePoints: Set[(Int, Int)] = {
    matrix match {
      case Nil :: _ => Set()
      case _ =>
        val rowsMax = matrix.map(_.max)
        val columnsMin =  matrix.transpose.map(_.min)
        val ret = for {

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trait Functor[F[_]] {
  def map[A, B](fa: F[A])(f: A => B): F[B]
}

trait Applicative[F[_]] extends Functor[F] {
  def apply[A, B](fab: F[A => B])(fa: F[A]): F[B] =
    map2(fab, fa)((ff, a) => ff(a))

  def unit[A](a: => A): F[A]

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public static int GetRevision()
{
    var p = new Process { StartInfo = new ProcessStartInfo
    {
        FileName = "git",
        Arguments = "rev-list HEAD --count",
        RedirectStandardInput = true,
        RedirectStandardOutput = true,
        RedirectStandardError = true,
        CreateNoWindow = true,

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/*
https://www.scala-exercises.org/cats/semigroup
 */

import cats.implicits._
import cats.kernel.Semigroup


Semigroup[Int].combine(1, 2)
Semigroup[List[Int]].combine(List(1, 2, 3), List(4, 5, 6))

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def traverse[A, B](a: List[A])(f: A => Option[B]): Option[List[B]] = {
  a match {
    case Nil    => Some(Nil)
    case h :: t =>
      println(h)
      f(h).flatMap(v => traverse(t)(f).map(v :: _))
  }
}

traverse(List(1,2,3,4,5))(x => if (x < 3) Some(x) else None)

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 출처: (https://ko.wikipedia.org/wiki/%EB%A0%88%EB%93%9C-%EB%B8%94%EB%9E%99_%ED%8A%B8%EB%A6%AC)

- 삽입 

	1. 삽입된 N이 첫 번째 노드이면 삽입, 아니면 2번
		void insert_case1(struct node *n)
		{
			if (n->parent == NULL) n->color = BLACK;
			else insert_case2(n);
		}

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sealed trait Color
case object Black extends Color
case object Red extends Color

case object Empty extends Tree { def color = Black }
case class Node(color: Color, left: Tree, value: Int, right: Tree) extends Tree
case object Leaf extends Tree { def color = Black }

sealed trait Tree {
  def color: Color

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# error handle
{Command} && ( {Success} ) || ( {Failed} )

에러가 발생하면 %%ERRORLEVEL%% 에 코드 저장됨
IF NOT errorlevel == 0 (ECHO ErrorLevel: %ERRORLEVEL%)

# 빈 줄 출력
ECHO.

# Token 검사