結果
問題 | No.1817 Reversed Edges |
ユーザー | yudedako |
提出日時 | 2022-01-25 18:03:56 |
言語 | Scala(Beta) (3.6.2) |
結果 |
AC
|
実行時間 | 1,702 ms / 2,000 ms |
コード長 | 1,365 bytes |
コンパイル時間 | 18,652 ms |
コンパイル使用メモリ | 262,988 KB |
実行使用メモリ | 85,904 KB |
最終ジャッジ日時 | 2024-12-16 10:16:03 |
合計ジャッジ時間 | 51,687 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 23 |
ソースコード
import scala.collection.mutable import scala.io.StdIn.* import scala.math.{min, max} @main def main = val n = readLine().toInt val edges = Array.fill(n - 1){ val Array(u, v) = readLine().trim().split(' ').map(_.toInt - 1) (min(u, v), max(u, v)) } val graph = Array.fill(n){Nil: List[Int]} for (u, v) <- edges do graph(u) ::= v graph(v) ::= u val depth = Array.fill(graph.length){-1} depth(0) = 0 val parent = Array.fill(graph.length){-1} val queue = mutable.Queue(0) while queue.nonEmpty do val current = queue.dequeue() for next <- graph(current) do if depth(next) == -1 then depth(next) = depth(current) + 1 queue.append(next) parent(next) = current var currentSum = edges.count((u, v) => depth(u) > depth(v)) val stack = mutable.Stack(0) val result = Array.fill(n){-1} val state = graph.clone() while stack.nonEmpty do val current = stack.pop() state(current) match case Nil => result(current) = currentSum if parent(current) >= 0 then currentSum += (if current > parent(current) then -1 else 1) case next::t => stack.push(current) state(current) = t if depth(current) < depth(next) then currentSum += (if current > next then -1 else 1) stack.push(next) println(result.mkString("\n"))