fun main(args: Array) { fun readLineLongArray(): List { val str = readLine() as String val arrStr = str.split(" ") val ret = arrStr.map { it.toLong() } return ret } fun readLineLong(): Long { val str = readLine() as String return str.toLong() } fun readLineInt(): Int { val str = readLine() as String return str.toInt() } fun readLineIntArray() : List { val str = readLine() as String val arrStr = str.split(" ") val ret = arrStr.map { it.toInt() } return ret } fun readLineDoubleArray(): List { val str = readLine() as String val arrStr = str.split(" ") val ret = arrStr.map { it.toDouble() } return ret } fun readLineDouble() : Double { val str = readLine() as String return str.toDouble() } fun readLineString() : String { return readLine() as String } // fun readLineStringArray(): List { // val str = readLine() as String // val arrStr = str.split(" ") // return arrStr // } val da = readLineDoubleArray() val r = da[0] val d = da[1] println(Math.sqrt(d*d-r*r)) }