val seenVertices = mutable.HashMap[Int, Int]()

    var bitMasks = for (i <- 0 to 24; j <- 0 to 24) yield (1 << i | 1 << j)
    bitMasks = 0 +: bitMasks

    var id = 0
    val uf = UnionFind(200000)
    val bufferedSource = Source.fromFile("/home/asznajder/Coursera/clustering_big.txt")
    for (line <- bufferedSource.getLines()) {
      if (!first) {
        val code = Integer.parseInt(line.replaceAll(" ", ""), 2)
        for (mask <- bitMasks) {
          val modifiedCode = code ^ mask
          seenVertices.get(modifiedCode) match {
            case Some(seen_id) => uf.union(id, seen_id)
            case None => {
              seenVertices(code) = id
            }
          }
        }
        id += 1
      } else {
        first = false
      }
    }
    bufferedSource.close()