Sherlock and GCD

Sherlock and GCD.scala

object Solution {
    def main(args: Array[String])={
        val lines = io.Source.stdin.getLines.drop(1)
        
        def gcd(a: Int, b: Int) : Int = if(b == 0) a else gcd(b, a % b)
        
        val tcs = lines.grouped(2).map( v => v(1)).map(l=>l.split("\\s+").map( s => s.toInt))
        val results = tcs.map(c => c.reduceLeft(gcd))
        results.foreach( r => println(if( r > 1)  "NO" else "YES" ))
        
    }
}