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  1. Lonely Integer
  2. Discussions

Lonely Integer

  • siyarp97
     + 0 comments

    Wrote this solution by Swift, not perfect about alghoritms anyone can improve this for any suggest?

    func lonelyInteger(arr : [Int]) -> Int{
    
    var checkinNum = -1
    var count = 0
    var res = 0
    
    var sorted = arr.sorted(by: <)
    var uniqArr = Array(Set(sorted))
    
    uniqArr.forEach { num in
        checkinNum = num
        count = 0
        sorted.filter { filterNum in
            if checkinNum == filterNum {
                count += 1
                return true
            }
            else{
                return false
            }
        }
        if count == 2{
            checkinNum = num
        }
        else{
            res = num
        }
    }
    return res
}