NGrams2.scala

package ngrams

import java.io.{ BufferedReader, FileReader }
import scala.collection.mutable

object NGrams2 extends App {
  val start = System.currentTimeMillis
  // download from https://github.com/codygman/faster-command-line-tools-with-haskell/raw/master/ngrams.tsv.tgz
  val br = new BufferedReader(new FileReader("ngrams.tsv"))
  val kvs = mutable.Map.empty[String, Int]
  var line: String = _
  var maxKey: String = _
  var maxValue = 0
  while ({ line = br.readLine; line != null }) {
    val ps = line.split('\t')
    val k = ps(1)
    val v = ps(2).toInt
    val v1 = kvs.getOrElse(k, 0) + v
    if (v1 > maxValue) {
      maxKey = k
      maxValue = v1
    }
    kvs(k) = v1
  }
  br.close()
  println(s"key = $maxKey, value = $maxValue, elapsed time = ${System.currentTimeMillis - start}")
}