leetcode——TwoSum（c#）

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控制台下运行

 public static void Main()
        {
            //Stopwatch sw = new Stopwatch();
            //sw.Start();

            int[] nums = new int[] { 3, 2, 4 };
            int target = 6;
            List a = TwoSum(nums, target);
            //sw.Stop();
            //TimeSpan ts = sw.Elapsed;
            //Console.WriteLine(ts.TotalMilliseconds);

        }
        public static List TwoSum(int[] nums, int target)
        {
            List result = new List();
            int[] result1 = new int[2];
            for (int i = 0; i < nums.Length; i++)
            {
                var x = nums.Select((a, index) => new { a, index }).Where(n => n.a == (target - nums[i]));
                if (x.ToList().Count() != 0 && i != x.ToList()[0].index)
                {
                    int[] res = { i, x.ToList()[0].index };
                    var y = result.Where(a => a[0] == x.ToList()[0].index && a[1] == i);
                    if (y.ToList().Count == 0)
                    {
                        result.Add(res);
                    }
                }

            }
            return result;
        }