我需要用递归法找到最便宜的路。这条路从点1开始,它需要穿过所有其他点(2,3,4,5),然后回到点1。每个点之间的行程成本在一个二维数组(map)中。

╔═══════════════════════╗
║    1|2|3|4|5|(points) ║
║ 1--0 1 3 4 2          ║
║ 2--1 0 4 2 6          ║
║ 3--3 4 0 7 1          ║
║ 4--4 2 7 0 7          ║
║ 5--2 6 1 7 0          ║
║ (points)              ║
╚═══════════════════════╝

这意味着,例如从点1到点5有2个“钱”成本,从点5到点4成本是7每次你在地图上切换“方向”。我认为尝试应该等于25(4+(一)
void FindingRoad(int[][] map, int[] pointsOrder, ref int tripCost, ref int attempts)
{

    if (attempts == 0)
    {
        return;
    }
    int tempCost = 0;
    int[] tempPointsOrder = new int[5];
    for (int i = 0; i < 5; i++)
    {
        for (int j = 0; j < 5; j++)
        {

        }
    }
    if (tempCost<tripCost)
    {
        tripCost = tempCost;
        pointsOrder = tempPointsOrder;
    }
    attempts--;
    FindingRoad(map,pointsOrder,ref tripCost,attempts);
}

预期道路(点顺序)输出应为1、5(2)、3(1)、2(4)、4(2)、1(4),成本=13
关于for循环的外观有什么建议吗?

最佳答案

主要有三个功能第1和第2步创建所有可能的道路,第3步计算其成本。希望能有所帮助

static void AllRoads(int[] a, int size, int n, RoadContainer VisiKeliai, int[][]map)
        {
            // if size becomes 1 then prints the obtained
            // permutation
            if (size == 1)
                printArr(a, n, VisiKeliai,map);

            for (int i = 0; i < size; i++)
            {
                AllRoads(a, size - 1, n, VisiKeliai,map);

                // if size is odd, swap first and last
                // element
                if (size % 2 == 1)
                {
                    int temp = a[0];
                    a[0] = a[size - 1];
                    a[size - 1] = temp;
                }

                // If size is even, swap ith and last
                // element
                else
                {
                    int temp = a[i];
                    a[i] = a[size - 1];
                    a[size - 1] = temp;
                }
            }
        }

        static void printArr(int[] a, int n, RoadContainer VisiKeliai, int[][]map)
        {
            string s = "0";
            // Console.WriteLine("dassaddsasdaasdas"  + a.Length);
            for (int i = 0; i < n; i++)
            {
                // Console.Write(a[i] + " ");
                s += Convert.ToString(a[i]);
            }
            s = s.Insert(s.Length, "0");
            Road r = new Road(s);
            CalculatingPrice(r, map);
            VisiKeliai.AddRoad(r);
            //Console.WriteLine(s);
        }

        public static void CalculatingPrice(Road Kelias, int[][] map)
        {
            //  021430 Road im checking
            Console.WriteLine("Kelias: " + Kelias.Path);
            for (int i = 0; i < Kelias.Path.Length - 1; i++)
            {
                int nextI = i + 1;
                for (int j = 0; j < 5; j++)
                {
                    for (int m = 0; m < 5; m++)
                    {
                        string a = Convert.ToString(m);
                        string aaa = Convert.ToString(Kelias.Path[i]);
                        string b = Convert.ToString(j);
                        string bbb = Convert.ToString(Kelias.Path[nextI]);
                        if (a == aaa && b == bbb)
                        {
                            Console.WriteLine(a + "--" + aaa + "---" + b + "----" + bbb + "-------------" + map[j][m]);
                            Kelias.Cost += map[j][m];
                        }

                    }

                }
            }

        }

10-06 01:21