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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 |