k-subSequence for HackerRank

Subsequences.scala

def kSub(k:Int,nums:Array[Int]):Long={
    val count=for {      
      i<-0 to nums.size
      j<-i to nums.size
      slice=nums.slice(i, j)      
      sum=slice.sum 
    } yield if (sum!=0 && (sum%k)==0) 1 else 0    
    count.sum
  }