LeetCode 01 Two Sum swift

func twoSum(_ nums: [Int], _ target: Int) -> [Int] {
    for x in 0 ..< nums.count{
        for y in x+1 ..< nums.count{
            if(target==nums[x]+nums[y]){
               return [x,y]
            }
        }
    }
    return [0];
}