向右旋转二维矩阵 [英] Rotate a 2d matrix to the right

问题描述

我想要一个 2d 矩阵向右旋转，它编译得很好，但是当我尝试运行时，它说 数组索引超出范围异常.例如，我希望 {{10,20,30},{40,50,60}} 旋转成 {{40,10},{50,20},{60,30}}:

I want a 2d matrix to rotate to the right, it compiles fine but when I try to the run it says that the array index is out of bounds exception. For example, I want {{10,20,30},{40,50,60}} to rotate into {{40,10},{50,20},{60,30}}:

public static int[][] rotate(int[][] m) {
    int[][] rotateM = new int[m[0].length][m.length];
    for (int i = 0; i < m.length; i++) {
        for (int j = 0; j < m[0].length; j++) {
            rotateM[i][j] = m[j][m.length - i - 1];
        }
    }
    return rotateM;
}

public static void main(String[] args) {
    int[][] m = {
            {10, 20, 30},
            {40, 50, 60}};
    System.out.println(Arrays.toString(rotate(m)));
}

推荐答案

这是一个工作示例:

private int[][] rotateMatrix(int[][] matrix) {
    int backupH = h;
    int backupW = w;
    w = backupH;
    h = backupW;
    int[][] ret = new int[h][w];
    for (int i = 0; i < h; ++i) {
        for (int j = 0; j < w; ++j) {
            ret[i][j] = matrix[w - j - 1][i];
        }
    }
    return ret;
}

我使用此代码在俄罗斯方块中旋转我的积木.此代码顺时针旋转矩阵.

I used this code to rotate my bricks in Tetris. This code rotates the matrix clockwise.

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