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scala:
import scala.io.StdIn object Solution { private val modulo = math.pow(10, 8).toInt + 7 private def catalanNumber(n: Int): BigInt = { if (n < 1) return 1 def factorial(end: Int, start: Int = 0, current: BigInt = 1): BigInt = { current * ((start + 1) to end).map(BigInt.apply).product } val fn = factorial(n) val fn1 = factorial(n + 1, start = n, current = fn) val f2n = factorial(2 * n, start = n + 1, current = fn1) f2n / (fn1 * fn) } def main(args: Array[String]): Unit = { val in = Iterator .continually(StdIn.readLine()) .takeWhile(null != _) .map(_.trim) val t = in.next().toInt (1 to t) .map(_ => in.next().toInt) .map(catalanNumber) .map(_ % modulo) .foreach(println) } }
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scala: