結果

問題 No.1299 Random Array Score
ユーザー 箱星箱星
提出日時 2020-11-27 21:37:08
言語 Kotlin
(1.9.23)
結果
AC  
実行時間 543 ms / 2,000 ms
コード長 2,656 bytes
コンパイル時間 15,712 ms
コンパイル使用メモリ 451,352 KB
実行使用メモリ 87,196 KB
最終ジャッジ日時 2024-07-26 11:55:54
合計ジャッジ時間 35,282 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 317 ms
53,280 KB
testcase_01 AC 315 ms
53,156 KB
testcase_02 AC 316 ms
53,464 KB
testcase_03 AC 520 ms
76,708 KB
testcase_04 AC 519 ms
76,132 KB
testcase_05 AC 514 ms
72,060 KB
testcase_06 AC 520 ms
70,436 KB
testcase_07 AC 498 ms
71,032 KB
testcase_08 AC 535 ms
75,764 KB
testcase_09 AC 390 ms
54,512 KB
testcase_10 AC 480 ms
63,104 KB
testcase_11 AC 454 ms
56,452 KB
testcase_12 AC 524 ms
69,724 KB
testcase_13 AC 515 ms
75,488 KB
testcase_14 AC 525 ms
70,272 KB
testcase_15 AC 506 ms
70,444 KB
testcase_16 AC 517 ms
70,300 KB
testcase_17 AC 456 ms
57,036 KB
testcase_18 AC 465 ms
63,800 KB
testcase_19 AC 474 ms
65,132 KB
testcase_20 AC 460 ms
59,716 KB
testcase_21 AC 343 ms
54,084 KB
testcase_22 AC 461 ms
57,956 KB
testcase_23 AC 519 ms
70,360 KB
testcase_24 AC 521 ms
71,964 KB
testcase_25 AC 517 ms
69,940 KB
testcase_26 AC 343 ms
53,668 KB
testcase_27 AC 450 ms
58,288 KB
testcase_28 AC 443 ms
56,888 KB
testcase_29 AC 447 ms
58,908 KB
testcase_30 AC 527 ms
69,624 KB
testcase_31 AC 458 ms
59,188 KB
testcase_32 AC 522 ms
75,536 KB
testcase_33 AC 528 ms
87,196 KB
testcase_34 AC 464 ms
65,772 KB
testcase_35 AC 543 ms
86,984 KB
testcase_36 AC 469 ms
65,624 KB
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ソースコード

diff # 

import java.io.InputStream
import java.io.PrintWriter
import java.util.*

// ModInt
// region
class ModInt(x: Long) {

    companion object {
        //const val MOD = 1000000007L
        const val MOD = 998244353L
    }

    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"
    }

}

val fac = mutableListOf<ModInt>()
val invfac = mutableListOf<ModInt>()

fun fact(n: Long, b: Boolean): ModInt {
    if (fac.count() == 0) {
        fac.add(ModInt(1))
        invfac.add(ModInt(1))
    }
    while (fac.count() <= n) {
        fac.add(fac.last() * ModInt(fac.count().toLong()))
        invfac.add(fac.last().inv())
    }
    return if (b) {
        fac[n.toInt()]
    } else {
        invfac[n.toInt()]
    }
}

fun comb(n: Long, k: Long): ModInt {
    return fact(n, true) * fact(k, false) * fact(n - k, false)
}

fun comb2(n: Long, k: Long): ModInt {
    var ans = ModInt(1)
    for (i in 0 until k) {
        ans = ans * ModInt(n - i) / ModInt(k - i)
    }
    return ans
}
// endregion

fun PrintWriter.solve() = with(FastScanner(System.`in`)) {
    val n = nextInt()
    val k = nextLong()
    val a = Array(n) { nextLong() }
    val s = a.sum()
    println(ModInt(s) * ModInt(2).pow(k))
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve()
    writer.flush()
}

class FastScanner(s: InputStream) {
    private var st = StringTokenizer("")
    private val br = s.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()
}
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