Commit 4761dd2

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added ClosestNumbers exercise

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	`1`	`+package org.codecraftlabs.leetcode`
	`2`	`+`
	`3`	`+object ClosestNumbers {`
	`4`	`+ def closestNumbers(arr: Array[Int]): Array[Int] = {`
	`5`	`+ val sortedArray = arr.sorted.toList`
	`6`	`+ val smallestDiff = sortedArray.sliding(2).map { case Seq(x, y, _*) => (y - x) }.toList.min`
	`7`	`+ sortedArray.sliding(2).toList.filter(pair => pair.last - pair.head == smallestDiff).flatten.toArray`
	`8`	`+ }`
	`9`	`+}`

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