結果

問題 No.1559 Next Rational
ユーザー 👑 箱箱
提出日時 2021-06-25 22:50:52
言語 Kotlin
(1.9.23)
結果
AC  
実行時間 279 ms / 2,000 ms
コード長 2,995 bytes
コンパイル時間 15,653 ms
コンパイル使用メモリ 425,096 KB
実行使用メモリ 50,720 KB
最終ジャッジ日時 2023-09-07 14:52:24
合計ジャッジ時間 22,418 ms
ジャッジサーバーID
（参考情報） 		judge12 / judge11
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 277 ms
50,380 KB
testcase_01 AC 272 ms
50,504 KB
testcase_02 AC 272 ms
50,540 KB
testcase_03 AC 272 ms
50,484 KB
testcase_04 AC 270 ms
50,256 KB
testcase_05 AC 278 ms
50,420 KB
testcase_06 AC 275 ms
50,320 KB
testcase_07 AC 267 ms
50,720 KB
testcase_08 AC 267 ms
50,412 KB
testcase_09 AC 268 ms
50,436 KB
testcase_10 AC 275 ms
50,664 KB
testcase_11 AC 274 ms
50,700 KB
testcase_12 AC 271 ms
50,336 KB
testcase_13 AC 270 ms
50,364 KB
testcase_14 AC 279 ms
50,668 KB
testcase_15 AC 270 ms
50,316 KB
testcase_16 AC 270 ms
50,496 KB
testcase_17 AC 270 ms
50,404 KB
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ソースコード

diff # 

import java.io.PrintWriter
import java.lang.Exception
import java.util.*

data class Matrix(val a: ModInt, val b: ModInt, val c: ModInt, val d: ModInt)

fun product(x: Matrix, y: Matrix): Matrix {
    val a = x.a * y.a + x.b * y.c
    val b = x.a * y.b + x.b * y.d
    val c = x.c * y.a + x.d * y.c
    val d = x.c * y.b + x.d * y.d
    return Matrix(a, b, c, d)
}

fun pow(m: Matrix, n: Long): Matrix {
    if (n == 0L) {
        return Matrix(ModInt(1), ModInt(0), ModInt(0), ModInt(1))
    } else if (n == 1L) {
        return m
    }
    val x = pow(m, n / 2)
    val y = product(x, x)
    if (n % 2 == 0L) {
        return y
    } else {
        return product(y, m)
    }
}

fun PrintWriter.solve() {
    val n = nextLong()
    val a = nextLong()
    val b = nextLong()
    val k = nextLong()
    val c = ModInt(a * a + b * b + k) / ModInt(a * b)
    val m = pow(Matrix(c, ModInt(-1), ModInt(1), ModInt(0)), n - 1)
    println(m.c * b.toModInt() + m.d * a.toModInt())
}

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

// 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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