48. Rotate Image - LeetCode

Question

48. Rotate Image

Solution

把这个二维数组(矩阵)看成一个一个环，循环每个环，循环每条边，每个边上的点进行旋转

public void rotate(int[][] matrix) {
    int n = matrix.length;
    for (int i = 0; i < n / 2; i++) {
        change(matrix, i);
    }
}

private void change(int[][] matrix, int i) {
    int n = matrix.length - 1;
    for (int j = i; j < n - i; j++) {
        int tmp = matrix[i][j];

        matrix[i][j] = matrix[n - j][i];
        matrix[n - j][i] = matrix[n - i][n - j];
        matrix[n - i][n - j] = matrix[j][n - i];
        matrix[j][n - i] = tmp;
    }
}

• https://gitee.com/okokabcd/leetcode
• http://www.cnblogs.com/boring09/p/4248697.html