chore: remove comments

Author: markkovari

2023/src/main/scala/day04.scala

@@ -42,43 +42,33 @@ def part2(input: String): BigInt =
 
 def countWinning(card: String): Int =
   val numbers = card
-    .substring(card.indexOf(":") + 1) // discard "Card X:"
+    .substring(card.indexOf(":") + 1)
     .split(" ")
     .filterNot(_.isEmpty())
   val (winningNumberStrs, givenNumberStrs) = numbers.span(_ != "|")
   val winningNumbers = winningNumberStrs.map(_.toInt).toSet
-  // drop the initial "|"
   val givenNumbers = givenNumberStrs.drop(1).map(_.toInt).toSet
   winningNumbers.intersect(givenNumbers).size
-end countWinning
 
 def winningCounts(input: String): Iterator[Int] =
   input.linesIterator.map(countWinning)
-end winningCounts
 
 def part1_(input: String): String =
   winningCounts(input)
     .map(winning => if winning > 0 then Math.pow(2, winning - 1).toInt else 0)
     .sum
     .toString()
-end part1_
 
 def part2_(input: String): String =
   winningCounts(input)
-    // we only track the multiplicities of the next few cards as needed, not all of them;
-    // and the first element always exists, and corresponds to the current card;
-    // and the elements are always positive (because there is at least 1 original copy of each card)
     .foldLeft((0, Vector(1))) { case ((numCards, multiplicities), winning) =>
       val thisMult = multiplicities(0)
       val restMult = multiplicities
         .drop(1)
-        // these are the original copies of the next few cards
         .padTo(Math.max(1, winning), 1)
         .zipWithIndex
-        // these are the extra copies we just won
         .map((mult, idx) => if idx < winning then mult + thisMult else mult)
       (numCards + thisMult, restMult)
     }
     ._1
     .toString()
-end part2_