回溯算法之迷宫问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SeqListSort
{
    /// <summary>
    /// <ather>
    /// <lihonglin>
    /// </ather>
    /// <content>
    /// 随机生成 Row 行* Col列的迷宫，0为可以通过，1为不可以通过，若可以通过显示出路径，不能通过则显示
    /// 出内容
    /// </content>
    /// </summary>
    public struct Point
    {
        public int x;
        public int y;
        public Point(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
    }
    class MazePath
    {
        const int ROW = 10;
        const int COL = 10;//
        //static int[,] map = new int[ROW,COL];
        //测试
        static int[,] map = new int[,]
                        {{1,1,1,1,1,1,1,1,1,1},
                        {1,0,1,1,1,0,1,1,1,1},
                        {1,0,0,1,0,1,1,1,1,1},
                        {1,0,1,0,0,0,0,0,1,1},
                        {1,0,0,0,1,0,1,0,1,1},
                        {1,1,1,0,1,1,0,0,1,1},
                        {1,0,1,0,0,0,1,0,0,1},
                        {1,0,1,1,0,0,1,1,0,1},
                        {1,0,1,1,0,0,0,0,0,1},
                        {1,1,1,1,1,1,1,1,1,1}};//迷宫地图
        static Stack<Point> path = new Stack<Point>();//迷宫路径

        public static void InitMap()
        {
            Random r = new Random();
            for (int i = 0; i < ROW; ++i )
            {
                for (int j = 0; j < COL; ++j )
                {
                    if ( 1 == i && 1 == j )
                    {
                        map[i, j] = 0;// 定义入口
                        Console.Write("   *");
                    }
                    else if (i == ROW - 2 && j == COL - 2)
                    {
                        map[i, j] = 0;//定义出口
                        Console.Write("   #");
                    }
                    else if ((0 == i || 0 == j) || (i == ROW - 1 || j == COL - 1))
                    {
                        map[i, j] = 1;//绘制墙
                        Console.Write("   " + map[i, j]);
                    }
                    else
                    {
                        map[i, j] = r.Next(0, 2);// 0为可以通过，1为不可以
                        Console.Write("   " + map[i,j]);
                    }
                }
                Console.WriteLine( );
            }
        }

        public static void FindPaths()
        {
            int i = 1;
            int j = 1;

            path.Push(new Point(i, j));
            // 从右边开始按照顺时针开始查询
            while( path.Count > 0 )
            {
                // right
                if (0 == map[i, j + 1])
                {
                    map[i, ++j] = 2;
                    path.Push(new Point(i, j));
                }
                // bottom
                else if (0 == map[i + 1, j] )
                {
                    map[++i, j] = 2;
                    path.Push(new Point(i, j));
                }
                //left
                else if (0 == map[i, j - 1])
                {
                    map[i, j - 1] = 2;
                    path.Push(new Point(i, j - 1));
                    j--;
                }
                // top
                else if (0 == map[i - 1, j])
                {
                    map[i - 1, j] = 2;
                    path.Push(new Point(i - 1, j));
                    i--;
                }
                else
                {
                    //Point p = path.Peek();
                    path.Pop();
                    if (path.Count <= 0)
                    {
                        Console.WriteLine("没有路径");
                        break;
                    }
                }

                i = path.Peek().x;
                j = path.Peek().y;
                if ( i == ROW - 2 && j == COL - 2)
                {
                    Console.WriteLine("找到路径显示如下：");
                    break;
                }

            }

            for (i = 0; i < ROW ; ++i)
            {
                for (j = 0; j < COL ; ++j)
                {
                    if (1 == i && 1 == j)
                    {
                        Console.Write("   *");
                    }
                    else if (i == ROW - 2 && j == COL - 2)
                    {
                        Console.Write("   #");
                    }
                    else
                        Console.Write("   " + map[i,j]);
                }
                Console.WriteLine( );
            }
        }
    }
}