import kotlin.math.*

fun quadratic(a: Double, b: Double, c: Double): Pair<Double, Double> {
    val d = b * b - 4 * a * c
    val sq = sqrt(d)
    return Pair((-b + sq) / (2 * a), (-b - sq) / (2 * a))
}

fun main() {
    val a = 1.0; val b = -1.0; val c = -1.0
    val (x1, x2) = quadratic(a, b, c)
    println("方程式の解は、$x1、$x2 です。")
}