結果

問題 No.2199 lower_bound and upper_bound
ユーザー 👑 箱
提出日時 2022-05-04 06:39:57
言語 Kotlin
(1.9.23)
結果
AC  
実行時間 478 ms / 2,000 ms
コード長 2,508 bytes
コンパイル時間 15,914 ms
コンパイル使用メモリ 443,384 KB
実行使用メモリ 137,592 KB
最終ジャッジ日時 2024-04-15 16:06:17
合計ジャッジ時間 27,402 ms
ジャッジサーバーID
(参考情報)
judge3 / judge2
このコードへのチャレンジ
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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 458 ms
137,436 KB
testcase_01 AC 454 ms
137,408 KB
testcase_02 AC 461 ms
137,428 KB
testcase_03 AC 457 ms
137,436 KB
testcase_04 AC 457 ms
137,592 KB
testcase_05 AC 462 ms
137,312 KB
testcase_06 AC 461 ms
137,288 KB
testcase_07 AC 462 ms
137,504 KB
testcase_08 AC 458 ms
137,212 KB
testcase_09 AC 459 ms
137,436 KB
testcase_10 AC 473 ms
137,532 KB
testcase_11 AC 457 ms
137,308 KB
testcase_12 AC 453 ms
137,204 KB
testcase_13 AC 478 ms
137,476 KB
testcase_14 AC 457 ms
137,368 KB
testcase_15 AC 449 ms
137,296 KB
testcase_16 AC 462 ms
137,352 KB
testcase_17 AC 465 ms
137,180 KB
testcase_18 AC 465 ms
137,532 KB
testcase_19 AC 473 ms
137,400 KB
testcase_20 AC 470 ms
137,352 KB
testcase_21 AC 467 ms
137,456 KB
testcase_22 AC 468 ms
137,316 KB
testcase_23 AC 473 ms
137,532 KB
testcase_24 AC 465 ms
137,448 KB
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ソースコード

diff #

fun main() {
    val (n, l, u) = readLongs()
    val cc = CombinationCalculator()
    var ans = ModInt(0)
    for (m in l..u) {
        ans += cc.binom(2 * n + m - 1, n - 1) - cc.binom(2 * n + m - 1, n + u + 1)
    }
    println(ans)
}

// 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"
    }
}
// endregion

class CombinationCalculator {
    companion object {
        private const val fac_size = 600000
    }

    private val arrFac = Array(fac_size) { ModInt(1) }
    private val arrInvfac = Array(fac_size) { ModInt(1) }

    init {
        for (i in 1 until fac_size) {
            arrFac[i] = arrFac[i - 1] * ModInt(i)
        }
        arrInvfac[fac_size - 1] = arrFac[fac_size - 1].inv()
        for (i in fac_size - 2 downTo 1) {
            arrInvfac[i] = arrInvfac[i + 1] * ModInt(i + 1)
        }
    }

    fun fac(n: Int): ModInt {
        return arrFac[n]
    }

    fun fac(n: Long): ModInt {
        return fac(n.toInt())
    }

    fun invfac(n: Int): ModInt {
        return arrInvfac[n]
    }

    fun invfac(n: Long): ModInt {
        return invfac(n.toInt())
    }

    fun binom(n: Long, k: Long): ModInt {
        return if (k in 0..n) {
            arrFac[n.toInt()] * arrInvfac[k.toInt()] * arrInvfac[(n - k).toInt()]
        } else {
            ModInt(0)
        }
    }
}

fun readLongs() = readln().split(" ").map { it.toLong() }
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