結果

問題 No.1582 Vertexes vs Edges
ユーザー yakamotoyakamoto
提出日時 2021-07-02 23:01:57
言語 Kotlin
(1.9.10)
結果
AC  
実行時間 698 ms / 2,000 ms
コード長 4,381 bytes
コンパイル時間 20,644 ms
コンパイル使用メモリ 435,340 KB
実行使用メモリ 65,492 KB
最終ジャッジ日時 2023-09-11 23:28:54
合計ジャッジ時間 41,877 ms
ジャッジサーバーID
(参考情報)
judge11 / judge15
このコードへのチャレンジ(β)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 295 ms
53,532 KB
testcase_01 AC 296 ms
53,692 KB
testcase_02 AC 299 ms
53,540 KB
testcase_03 AC 303 ms
53,656 KB
testcase_04 AC 404 ms
58,168 KB
testcase_05 AC 622 ms
65,148 KB
testcase_06 AC 407 ms
58,128 KB
testcase_07 AC 464 ms
59,120 KB
testcase_08 AC 525 ms
61,104 KB
testcase_09 AC 595 ms
65,168 KB
testcase_10 AC 558 ms
63,260 KB
testcase_11 AC 429 ms
58,204 KB
testcase_12 AC 514 ms
60,964 KB
testcase_13 AC 560 ms
62,920 KB
testcase_14 AC 573 ms
62,968 KB
testcase_15 AC 608 ms
63,120 KB
testcase_16 AC 558 ms
61,000 KB
testcase_17 AC 582 ms
58,868 KB
testcase_18 AC 667 ms
65,232 KB
testcase_19 AC 588 ms
63,132 KB
testcase_20 AC 561 ms
58,944 KB
testcase_21 AC 543 ms
59,016 KB
testcase_22 AC 637 ms
65,108 KB
testcase_23 AC 528 ms
61,036 KB
testcase_24 AC 477 ms
58,944 KB
testcase_25 AC 562 ms
61,180 KB
testcase_26 AC 532 ms
61,108 KB
testcase_27 AC 642 ms
64,080 KB
testcase_28 AC 507 ms
58,984 KB
testcase_29 AC 587 ms
63,612 KB
testcase_30 AC 549 ms
60,780 KB
testcase_31 AC 610 ms
62,876 KB
testcase_32 AC 529 ms
58,840 KB
testcase_33 AC 698 ms
65,096 KB
testcase_34 AC 691 ms
65,016 KB
testcase_35 AC 667 ms
65,492 KB
testcase_36 AC 291 ms
53,552 KB
testcase_37 AC 297 ms
53,740 KB
testcase_38 AC 306 ms
53,732 KB
権限があれば一括ダウンロードができます
コンパイルメッセージ
Main.kt:78:32: warning: unnecessary non-null assertion (!!) on a non-null receiver of type Int
        dp[v][1] += dp[u].min()!!
                               ^
Main.kt:176:11: warning: expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types
  private inline fun debug(a: LongArray) {
          ^
Main.kt:180:11: warning: expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types
  private inline fun debug(a: IntArray) {
          ^
Main.kt:184:11: warning: expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types
  private inline fun debug(a: BooleanArray) {
          ^
Main.kt:188:11: warning: expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types
  private inline fun toString(a: BooleanArray) = run{a.map { if (it) 1 else 0 }.joinToString("")}
          ^
Main.kt:190:11: warning: expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types
  private inline fun debugDim(A: Array<LongArray>) {
          ^
Main.kt:197:11: warning: expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types
  private inline fun debugDim(A: Array<IntArray>) {
          ^
Main.kt:204:11: warning: expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types
  private inline fun debugDim(A: Array<BooleanArray>) {
          ^
Main.kt:221:11: warning: expected performance impact from inlining is insignificant. Inlining works best for functions with parameters of functional types
  private inline fun assert(b: Boolean) = run{if (!b) throw AssertionError()}
          ^

ソースコード

diff #

import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.lang.AssertionError
import java.util.*
import kotlin.math.abs
import kotlin.math.max
import kotlin.math.min

/**
 * (dist, parent, queue)
 * @param rt ルートノードを指定する。nullの場合は全ノード辿るまで繰り返す
 */
fun traceBfs(g: Array<IntArray>, rt: Int? = 0): Array<IntArray> {
  val n = g.size
  val q = IntArray(n)
  val d = IntArray(n)
  val p = IntArray(n){-2}
  var h = 0
  var t = 0

  fun bfs(rt: Int) {
    p[rt] = -1
    q[t++] = rt
    d[rt] = 0
    while (h < t) {
      val v = q[h++]
      for (i in g[v].indices) { // List<Int>に変更したときこちらの方法でないとiterator生成して遅くなる
        val u = g[v][i]
        if (p[u] == -2) {
          p[u] = v
          q[t++] = u
          d[u] = d[v] + 1
        }
      }
    }
  }

  if (rt != null) {
    bfs(rt)
  } else {
    for (v in 0 until n) {
      if (p[v] != -2) continue
      bfs(v)
    }
  }
  return arrayOf(d, p, q)
}
fun packUGraph(n: Int, from: IntArray, to: IntArray): Array<IntArray> {
  val p = IntArray(n)
  val m = from.size
  for (i in 0 until m) {
    ++p[from[i]]
    ++p[to[i]]
  }
  val g = Array(n){IntArray(p[it])}
  for (i in 0 until m) {
    g[from[i]][--p[from[i]]] = to[i]
    g[to[i]][--p[to[i]]] = from[i]
  }
  return g
}
class Solver(stream: InputStream, private val out: java.io.PrintWriter) {
  private val reader = BufferedReader(InputStreamReader(stream), 32768)

  fun solve() {
    val N = ni()
    val (from, to) = na2(N - 1, -1)
    val g = packUGraph(N, from, to)
    val (_, par, que) = traceBfs(g)
    val dp = Array(N){IntArray(2)} // 0:白 1:黒
    for (itr in N - 1 downTo 0) {
      val v = que[itr]
      dp[v][1]++
      for (u in g[v]) {
        if (par[v] == u) continue
        dp[v][0] += dp[u][1]
        dp[v][1] += dp[u].min()!!
      }
    }

    val ans = dp[0].min()
    out.println(ans)
  }













































  private val isDebug = try {
    // なんか本番でエラーでる
    System.getenv("MY_DEBUG") != null
  } catch (t: Throwable) {
    false
  }

  private var tokenizer: StringTokenizer? = null
  private fun next(): String {
    while (tokenizer == null || !tokenizer!!.hasMoreTokens()) {
      tokenizer = StringTokenizer(reader.readLine())
    }
    return tokenizer!!.nextToken()
  }

  private fun ni() = next().toInt()
  private fun nl() = next().toLong()
  private fun ns() = next()
  private fun na(n: Int, offset: Int = 0): IntArray {
    return IntArray(n) { ni() + offset }
  }
  private fun nal(n: Int, offset: Int = 0): LongArray {
    val res = LongArray(n)
    for (i in 0 until n) {
      res[i] = nl() + offset
    }
    return res
  }

  private fun na2(n: Int, offset: Int = 0): Array<IntArray> {
    val a  = Array(2){IntArray(n)}
    for (i in 0 until n) {
      for (e in a) {
        e[i] = ni() + offset
      }
    }
    return a
  }

  private inline fun debug(msg: () -> String) {
    if (isDebug) System.err.println(msg())
  }

  /**
   * コーナーケースでエラー出たりするので、debug(dp[1])のように添え字付きの場合はdebug{}をつかうこと
   */
  private inline fun debug(a: LongArray) {
    debug { a.joinToString(" ") }
  }

  private inline fun debug(a: IntArray) {
    debug { a.joinToString(" ") }
  }

  private inline fun debug(a: BooleanArray) {
    debug { toString(a) }
  }

  private inline fun toString(a: BooleanArray) = run{a.map { if (it) 1 else 0 }.joinToString("")}

  private inline fun debugDim(A: Array<LongArray>) {
    if (isDebug) {
      for (a in A) {
        debug(a)
      }
    }
  }
  private inline fun debugDim(A: Array<IntArray>) {
    if (isDebug) {
      for (a in A) {
        debug(a)
      }
    }
  }
  private inline fun debugDim(A: Array<BooleanArray>) {
    if (isDebug) {
      for (a in A) {
        debug(a)
      }
    }
  }

  /**
   * 勝手にimport消されるのを防ぎたい
   */
  private fun hoge() {
    min(1, 2)
    max(1, 2)
    abs(-10)
  }

  private inline fun assert(b: Boolean) = run{if (!b) throw AssertionError()}
  private inline fun assert(b: Boolean, f: () -> String) = run{if (!b) throw AssertionError(f())}
}

fun main() {
  val out = java.io.PrintWriter(System.out)
  Solver(System.`in`, out).solve()
  out.flush()
}
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