JAVA：如何创建一个蛇形矩阵 [英] JAVA : How to create a snake shape matrix

问题描述

您好我想创建使用二维数组在控制台上的矩阵。这个想法是，输出应该像这样的：

Hi I am trying to create a matrix on the console using 2D array. The idea is that the output should look like this one :

1|8|9 |16
2|7|10|15
3|6|11|14
4|5|12|13

有没有谁拥有一个想法，它是如何做到的呢？

Is there any one who has an idea how it can be done?

推荐答案

很少有东西您可以从矩阵猜测： -

Few things you can guess from the matrix: -

• 首先，你必须先移动到下一列前遍历列的所有行

• First, you have to traverse all rows of a columns first before moving to the next column

其次，你需要向下和向上的方向每次迭代

Second, you need to alternate between downwards and upwards direction on each iteration

所以，你需要的两个嵌套的循环，通过迭代行的特定列。一会从 0一行去到最大 - 1 ，接下来会从行=最大值 - 1 0

So, you would need two nested for loop, for iterating through rows for a particular column. One will go from row 0 to max - 1, and the next will go from row = max - 1 to 0.

现在，交替迭代的方向，你可以使用一个布尔变量，而内循环完成的每一次迭代后，其切换。

Now, to alternate the iteration direction, you can use a boolean variable, and toggle it after each iteration of inner loop finishes.

每个回路需要内部的的if-else 来包围。两者将在一定的条件下被执行。如果布尔向下= FALSE; ，然后循环向上移动将被执行，反之亦然

Each loop needs to be enclosed inside an if-else. Both of them will be executed on a certain condition. If boolean downwards = false;, then loop moving upwards will be executed and vice-versa.

在每次迭代中，填补了当前单元格与整数计数器，你将不得不使用 1 来初始化，并且每个填充后增加它。

On each iteration, fill the current cell with an integer counter, that you would have to initialize with 1, and increment it after each fill.

伪code： -

    // Initialize variables row, col, and count = 1

    boolean goDown = true;

    int[][] matrix = new int[row][col];  // declare matrix

    for i = 0 to col:
        if (goDown)
            for j = 0 to row:  // Move in downwards direction
                assign count++ to matrix[j][i] 
                // assign to `[j][i]` because, we have to assign to rows first

            goDown = false;    // Toggle goDown

        else
            for j = row - 1 to 0:  // Move in upwards direction
                assign count++ to matrix[j][i] 

            goDown = true;  // toggle goDown

    }

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