它开着！）
static List<List<int>> comb;static bool[] used;static void GetCombinationSample(){ int[] arr = { 10, 50, 3, 1, 2 }; used = new bool[arr.Length]; used.Fill(false); comb = new List<List<int>>(); List<int> c = new List<int>(); GetComb(arr, 0, c); foreach (var item in comb) { foreach (var x in item) { Console.Write(x + ","); } Console.WriteLine(""); }}static void GetComb(int[] arr, int colindex, List<int> c){ if (colindex >= arr.Length) { comb.Add(new List<int>(c)); return; } for (int i = 0; i < arr.Length; i++) { if (!used[i]) { used[i] = true; c.Add(arr[i]); GetComb(arr, colindex + 1, c); c.RemoveAt(c.Count - 1); used[i] = false; } }}
