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1207. Unique Number of Occurrences

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leetcode-scala/src/main/scala/LeetCode75/HashMap_Set
- 1207. Unique Number of Occurrences.sc

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	`1`	`+object Solution {`
	`2`	`+ def uniqueOccurrences(arr: Array[Int]): Boolean = {`
	`3`	`+ val occurrences = arr.zipWithIndex.groupBy(_._1).map { case (k, v) => v.map(_._2).length }`
	`4`	`+ occurrences.size == occurrences.toSet.size`
	`5`	`+ }`
	`6`	`+}`
	`7`	`+`
	`8`	`+Solution.uniqueOccurrences(Array(1,2,2,1,1,3)) // true`
	`9`	`+Solution.uniqueOccurrences(Array(1,2)) // false`
	`10`	`+Solution.uniqueOccurrences(Array(3,5,-2,-3,-6,-6)) // false`
	`11`	`+Solution.uniqueOccurrences(Array(-3,0,1,-3,1,1,1,-3,10,0)) // true`

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