记录Leetcode的题（一）swift5.1

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func defangIPaddr(_ address: String) -> String {
        var address_new = ""
        for value in address {
            if value == "." {
                address_new += "[.]"
                continue
            }
            address_new += String(value)
        }
        return address_new
    }

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func intersection(_ nums1: [Int], _ nums2: [Int]) -> [Int] {
        return Set(nums1).intersection(Set(nums2)).map{ $0 }
    }

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func uniqueOccurrences(_ arr: [Int]) -> Bool {
        let arr1 = Set(arr)
        var arr2 = Set<Int>()
        for (_,value) in arr1.enumerated() {
            arr2.insert(arr.filter{ $0 == value }.count)
        }
        
        return arr2.count ==  arr1.count
    }

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func twoSum(_ nums: [Int], _ target: Int) -> [Int] {
        var nums_new = Set<Int>()
        for (index,value) in nums.enumerated() {
            if nums_new.contains(target - value) {
                return [nums.firstIndex(of: target - value)!,index]
            }
            nums_new.insert(value)
        }
        return []
    }