[原创]一个数组整数环绕算法

  今天看到一位网友碰到的一道面试题目,觉得挺有意思的,就写了一下算法:

  题目:打印下面这个矩阵

  1  2  3  4  5  6

  20  21  22  23  24  7

  19  32  33  34  25  8

  18  31  36  35  26  9

  17  30  29  28  27  10

  16  15  14  13  12  11

   

代码如下:class program
 {
    static void Main(string[] args)
    {
       new program().Run();
    }

 

 //各方向环绕的次数

  int right = 1;
  int down = 0;
  int left = 0;
  int up = 0;


  int n = 6; //矩阵 N*N

 //矩阵行与列  

  int row = 0;
  int col = 0;


  Direction direction = Direction.Right;
  int[,] a = new int[6, 6];

  enum Direction
  {
     Right = 0,
     Down = 1,
     Left = 2,
     Up = 3
  }

  void Run()
  {
     for (int i = 1; i <= n * n; i++)
     {
        a[row, col] = i;
        Fang();
     }

 

     for (int i = 0; i < 6; i++)
     {
        for (int j = 0; j < 6; j++)
        {
           Console.Write(" {0} ", a[i, j]);
        }

        Console.Write("\n");
     }

     Console.Read();
  }

 

  void Fang()
  {
     switch (direction)
     {
        case Direction.Right:
           if (col < n - down - 1)
           {
              col++;
           }
           else
           {
              direction = Direction.Down;
              row++;
              down++;
           }
           break;
          case Direction.Down:
           if (row < n - left - 1)
           {
              row++;
           }
           else
           {
              direction = Direction.Left;
              col--;
              left++;
           }
           break;
          case Direction.Left:
             if (col > up)
             {
                col--;
             }
             else
             {
                direction = Direction.Up;
                up++;
                row--;
             }
             break;
          case Direction.Up:
             if (row > right)
             {
                row--;
             }
             else
             {
                direction = Direction.Right;
                right++;
                col++;
             }
             break;
         }
    }
 }

 

posted on 2010-11-12 17:06  Macou  阅读(529)  评论(3编辑  收藏  举报

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