You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Follow up:
Could you do this in-place?
代码语言：txt复制 public void rotate(int[][] matrix) {
if (matrix == null || matrix.length == 0 || matrix[0].length == 0) {
return;
}
final int mx = matrix.length;
final int my = matrix[0].length;
int x, y;
int t;
int _my = my - 1;
for (x = 0; x < mx - 1; x ) {
for (y = 0; y < _my; y ) {
int ny = mx - 1 - x;
int nx = my - 1 - y;
t = matrix[y][x];
matrix[y][x] = matrix[ny][nx];
matrix[ny][nx] = t;
}
_my--;
}
for (x = 0; x < mx; x ) {
for (y = 0; y < my / 2; y ) {
int ny = my - 1 - y;
int nx = x;
t = matrix[y][x];
matrix[y][x] = matrix[ny][nx];
matrix[ny][nx] = t;
}
}
}
