object Solution {
def readBinaryWatch(turnedOn: Int): List[String] = {
var ans = scala.collection.mutable.ArrayBuffer[String]()
for(h <- 0 to 11;m <- 0 to 59){
if(Integer.bitCount(h) + Integer.bitCount(m) == turnedOn) {
ans += (h + ":" + (if(m<10) "0" else "")+m)
}
}
ans.toList
}
}
Q.E.D.