結果

問題 No.2023 Tiling is Fun
ユーザー 箱星箱星
提出日時 2022-03-04 19:34:21
言語 Kotlin
(1.9.23)
結果
AC  
実行時間 308 ms / 2,000 ms
コード長 2,842 bytes
コンパイル時間 16,171 ms
コンパイル使用メモリ 450,756 KB
実行使用メモリ 59,560 KB
最終ジャッジ日時 2024-07-19 11:41:32
合計ジャッジ時間 21,744 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge1
このコードへのチャレンジ
（要ログイン）

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 284 ms
50,144 KB
testcase_01 AC 294 ms
53,088 KB
testcase_02 AC 287 ms
52,584 KB
testcase_03 AC 297 ms
54,836 KB
testcase_04 AC 284 ms
50,508 KB
testcase_05 AC 291 ms
54,152 KB
testcase_06 AC 297 ms
55,960 KB
testcase_07 AC 296 ms
55,972 KB
testcase_08 AC 292 ms
56,520 KB
testcase_09 AC 295 ms
58,788 KB
testcase_10 AC 290 ms
53,204 KB
testcase_11 AC 283 ms
50,152 KB
testcase_12 AC 285 ms
49,928 KB
testcase_13 AC 284 ms
50,068 KB
testcase_14 AC 285 ms
49,836 KB
testcase_15 AC 295 ms
59,412 KB
testcase_16 AC 288 ms
50,196 KB
testcase_17 AC 301 ms
59,560 KB
testcase_18 AC 301 ms
59,272 KB
testcase_19 AC 308 ms
59,204 KB
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 # 

import java.io.PrintWriter
import java.util.*
import kotlin.math.*

fun PrintWriter.solve() {
    val a = nextLong()
    val b = nextLong()
    println(binomSimple(a + b - 2, a - 1))
}

// region ModInt
class ModInt(x: Long) {
    companion object {
        const val MOD = 998244353L
        //const val MOD = 1000000007L
    }

    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"
    }
}

class ModIntArray(n: Int) {
    private val a = LongArray(n) { 0L }

    constructor(n: Int, init: (Int) -> ModInt) : this(n) {
        for (i in 0 until n) {
            a[i] = init(i).x
        }
    }

    operator fun set(i: Int, x: ModInt) {
        a[i] = x.x
    }

    operator fun get(i: Int): ModInt {
        return ModInt(a[i])
    }

    fun joinToString(s: String): String {
        return a.joinToString(s)
    }
}

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", abs(1L.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
0