import scala.collection.mutable._

​

object Main {

  def miniVariationLength(nums: Array[Int], threshold: Int): Int = {

    val maxDeque = new ArrayDeque[Int]

    val minDeque = new ArrayDeque[Int]

    var start = 0

    var end = 0

    var ans = 0

    while (end < nums.length) {

​

      // All elements greater than current index element gets removed from minDeque

      while (!minDeque.isEmpty && (nums(end) < nums(minDeque(minDeque.size-1)))) {

        minDeque.removeLast() // pop from end

      }

      // All elements smaller than current index element gets removed from minDeque

      while ( !maxDeque.isEmpty && (nums(end) > nums(maxDeque(maxDeque.size-1)))) {

        maxDeque.removeLast()

      }

      // append at end of both deques

      minDeque += end

      maxDeque += end

      val variation = nums(maxDeque.head) - nums(minDeque.head)

      if (variation > threshold) {

        start += 1

        // A new sub-array is starting so elements from previous one should

        // be removed from both the deques

        if (start > minDeque.head)

          minDeque.removeHead() // pop from front

        if (start > maxDeque.head)

          maxDeque.removeHead()

      }

      ans = Math.max(ans, end - start + 1)

      end += 1

    }

    ans

  }

​

  def main(args: Array[String]): Unit = { // Driver code

    val trafficRates = Array(10, 1, 2, 4, 7, 2)

    val thresholdMiniVal = 5

    println("The traffic of this customer changes by less than or equal to " + thresholdMiniVal + " Gbps in a " + miniVariationLength(trafficRates, thresholdMiniVal) + " day window")

  }

}