結果

問題 No.1521 Playing Musical Chairs Alone
ユーザー 👑 箱箱
提出日時 2021-10-20 15:52:01
言語 Kotlin
(1.9.23)
結果
AC  
実行時間 1,116 ms / 2,000 ms
コード長 4,281 bytes
コンパイル時間 16,904 ms
コンパイル使用メモリ 457,044 KB
実行使用メモリ 69,716 KB
最終ジャッジ日時 2023-10-20 11:02:10
合計ジャッジ時間 34,111 ms
ジャッジサーバーID
（参考情報） 		judge11 / judge12
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 284 ms
54,036 KB
testcase_01 AC 292 ms
54,052 KB
testcase_02 AC 292 ms
56,088 KB
testcase_03 AC 290 ms
54,024 KB
testcase_04 AC 283 ms
54,036 KB
testcase_05 AC 523 ms
59,388 KB
testcase_06 AC 478 ms
59,352 KB
testcase_07 AC 598 ms
59,424 KB
testcase_08 AC 348 ms
59,380 KB
testcase_09 AC 346 ms
59,364 KB
testcase_10 AC 294 ms
56,088 KB
testcase_11 AC 813 ms
67,732 KB
testcase_12 AC 284 ms
54,024 KB
testcase_13 AC 285 ms
56,080 KB
testcase_14 AC 328 ms
59,292 KB
testcase_15 AC 854 ms
67,648 KB
testcase_16 AC 946 ms
67,720 KB
testcase_17 AC 930 ms
67,720 KB
testcase_18 AC 891 ms
67,656 KB
testcase_19 AC 880 ms
67,724 KB
testcase_20 AC 946 ms
67,664 KB
testcase_21 AC 931 ms
67,652 KB
testcase_22 AC 891 ms
67,728 KB
testcase_23 AC 804 ms
61,508 KB
testcase_24 AC 890 ms
67,700 KB
testcase_25 AC 1,116 ms
69,716 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 n = nextInt()
    val k = nextLong()
    val l = nextInt()
    val a = Array(n) { Array(n) { ModInt(0) } }
    for (i in 0 until n) {
        for (x in 1..l) {
            val j = (i + x) % n
            a[i][j] = ModInt(1)
        }
    }
    val mat = Matrix(a).pow(k).mat
    for (i in 0 until n) {
        println(mat[0][i])
    }
}

// region Matrix
class Matrix(val mat: Array<Array<ModInt>>) {
    private val n = mat.size

    constructor(a: Array<Array<Int>>) : this(Array(a.size) { i -> Array(a.size) { j -> a[i][j].toModInt() } })
    constructor(a: Array<Array<Long>>) : this(Array(a.size) { i -> Array(a.size) { j -> a[i][j].toModInt() } })

    operator fun plus(other: Matrix): Matrix {
        val b = mat.copyOf()
        for (i in 0 until n) {
            for (j in 0 until n) {
                b[i][j] += other.mat[i][j]
            }
        }
        return Matrix(b)
    }

    operator fun minus(other: Matrix): Matrix {
        val b = mat.copyOf()
        for (i in 0 until n) {
            for (j in 0 until n) {
                b[i][j] -= other.mat[i][j]
            }
        }
        return Matrix(b)
    }

    operator fun times(other: Matrix): Matrix {
        val b = zero(n).mat
        for (k in 0 until n) {
            for (i in 0 until n) {
                for (j in 0 until n) {
                    b[i][j] += mat[i][k] * other.mat[k][j]
                }
            }
        }
        return Matrix(b)
    }

    fun pow(exp: Long): Matrix {
        if (exp == 0L) return e(n)
        var a = pow(exp shr 1)
        a *= a
        if (exp and 1L == 0L) return a
        return this * a
    }

    override fun toString(): String {
        return mat.joinToString("\n") { "[${it.joinToString()}]" }
    }
}

fun zero(n: Int): Matrix {
    return Matrix(Array(n) { Array(n) { ModInt(0) } })
}

fun e(n: Int): Matrix {
    return Matrix(Array(n) { i -> Array(n) { j -> ModInt(if (i == j) 1 else 0) } })
}
// endregion

// 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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