排列组合(回溯法)代码,CSharp代码库,德仔网

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【CSharp】排列组合(回溯法)

作者:冥想_ / 发布于2014/6/17/ 471


	class Program
	 {
	 private static List<string> TargetRoad = new List<string>(0);
	 private static List<string> PassedRoad = new List<string>(0);
	 private static List<int> InputArray = new List<int>();
	 private static string road = string.Empty;
	 static void Main()
	 {
	 for (int Index = 1; Index <= 20; Index++)
	 {
	 InputArray.Add(Index);
	 }
	 TraceBack(road);
	 foreach (var item in TargetRoad)
	 {
	 System.Diagnostics.Trace.WriteLine(item);
	 }
	 foreach (var item in PassedRoad)
	 {
	 System.Diagnostics.Trace.WriteLine(item);
	 }

	 }

	 static void TraceBack(string CurrentRoad="", int NextStep = 0)
	 {
	 int Index = 0;
	 if (NextStep > 0)
	 {
	 Index = NextStep;
	 }
	 for (; Index < InputArray.Count(); Index++)
	 {
	 int num = 0;
	 if (!string.IsNullOrEmpty(CurrentRoad) && !CurrentRoad.Contains(","))
	 {
	 num = int.Parse(CurrentRoad);
	 }
	 if (CurrentRoad.Contains(","))
	 {
	 string[] array = CurrentRoad.Split(new char[] { ',' });
	 foreach (var item in array)
	 {
	 num += int.Parse(item);
	 }
	 }
	 if (InputArray[Index] + num == 20)
	 {
	 string TempStrNum = string.Empty;
	 if (string.IsNullOrEmpty(CurrentRoad))
	 {
	 TempStrNum = InputArray[Index].ToString();
	 }
	 else
	 {
	 TempStrNum = CurrentRoad + "," + InputArray[Index].ToString();
	 }
	 if (!TargetRoad.Exists(a => a.Equals(TempStrNum)))
	 {
	 TargetRoad.Add(TempStrNum);
	 if (CurrentRoad.Contains(","))
	 {
	 CurrentRoad = CurrentRoad.Remove(CurrentRoad.LastIndexOf(','));
	 }
	 else
	 {
	 CurrentRoad = string.Empty;
	 }
	 }
	 break;
	 }
	
	 if (InputArray[Index] + num > 20)
	 {
	 if (CurrentRoad.Contains(","))
	 {
	 CurrentRoad = CurrentRoad.Remove(CurrentRoad.LastIndexOf(','));

	 }
	 else
	 {
	 CurrentRoad = string.Empty;
	 }
	 break;
	 }
	 if (InputArray[Index] + num < 20)
	 {
	 string TempValue = string.IsNullOrEmpty(CurrentRoad) ? InputArray[Index].ToString() : CurrentRoad + "," + InputArray[Index].ToString();
	 if (!PassedRoad.Exists(a => a.Equals(TempValue)))
	 {
	 CurrentRoad = TempValue;
	 PassedRoad.Add(CurrentRoad);
	 TraceBack(CurrentRoad, Index + 1);
	 }
	 else
	 {
	 break;
	 }
	 }
	 }
	 }
	 }

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