def twoSum(nums: Array[Int], target: Int): Array[Int] = {
    val numMap = nums.zipWithIndex.map(t => (t._1, t._2)).toMap

    for(i <- 0 to nums.length) {
      if(numMap.keySet.contains(target - nums(i)) && nums(i) != (target - nums(i))) {
        return Array(i, numMap.get(target - nums(i)).get)
      }
    }

    Array.emptyIntArray
  }