結果

問題 No.1749 ラムドスウイルスの感染拡大
ユーザー 箱星
提出日時 2021-10-13 13:11:39
言語 Kotlin
(2.1.0)
結果
AC  
実行時間 454 ms / 2,000 ms
コード長 2,831 bytes
コンパイル時間 13,834 ms
コンパイル使用メモリ 448,108 KB
実行使用メモリ 135,500 KB
最終ジャッジ日時 2024-12-31 18:32:46
合計ジャッジ時間 24,696 ms
ジャッジサーバーID
(参考情報)
judge3 / judge4
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 4
other AC * 26
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

import java.io.PrintWriter
import java.util.*
import kotlin.math.*
fun PrintWriter.solve() {
val n = nextInt()
val m = nextInt()
val t = nextInt()
val adj = Array(n) { mutableListOf<Int>() }
for (i in 0 until m) {
val v1 = nextInt()
val v2 = nextInt()
adj[v1].add(v2)
adj[v2].add(v1)
}
val num = Array(t + 1) { Array(n) { ModInt(0) } }
num[0][0] = ModInt(1)
for (i in 0 until t) {
for (j in 0 until n) {
for (k in adj[j]) {
num[i + 1][j] += num[i][k]
}
}
}
println(num[t][0])
}
// region ModInt
class ModInt(x: Long) {
companion object {
//const val MOD = 1000000007L
const val MOD = 998244353L
}
constructor(y: Int) : this(y.toLong())
val x = (x % MOD + MOD) % MOD
operator fun plus(other: ModInt): ModInt {
return ModInt(x + other.x)
}
operator fun minus(other: ModInt): ModInt {
return ModInt(x - other.x)
}
operator fun times(other: ModInt): ModInt {
return ModInt(x * other.x)
}
operator fun div(other: ModInt): ModInt {
return this * other.inv()
}
fun pow(exp: Long): ModInt {
if (exp == 0L) return ModInt(1L)
var a = pow(exp shr 1)
a *= a
if (exp and 1L == 0L) return a
return this * a
}
fun inv(): ModInt {
return this.pow(MOD - 2)
}
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (javaClass != other?.javaClass) return false
other as ModInt
if (x != other.x) return false
return true
}
override fun hashCode(): Int {
return x.hashCode()
}
override fun toString(): String {
return "$x"
}
}
fun Long.toModInt(): ModInt {
return ModInt(this)
}
fun Int.toModInt(): ModInt {
return ModInt(this)
}
fun binomSimple(n: Long, k: Long): ModInt {
var numer = ModInt(1)
var denom = ModInt(1)
for (i in 0 until k) {
numer *= ModInt(n - i)
denom *= ModInt(k - i)
}
return numer / denom
}
// endregion
fun main() {
Thread(null, {
val writer = PrintWriter(System.out, false)
writer.solve()
writer.flush()
}, "solve", 1.shl(26))
.apply { setUncaughtExceptionHandler { _, e -> e.printStackTrace(); kotlin.system.exitProcess(1) } }
.apply { start() }.join()
}
// region Scanner
private var st = StringTokenizer("")
private val br = System.`in`.bufferedReader()
fun next(): String {
while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())
return st.nextToken()
}
fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextLine() = br.readLine()
fun nextDouble() = next().toDouble()
// endregion
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