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leetcode--Rotate Image
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?
public class Solution { /**The algorithm is simple. * @author Averill Zheng * @version 2014-06-15 * @since JDK 1.7 */ public void rotate(int[][] matrix) { int length = matrix.length; for(int i = 0; i < length / 2; ++i){ for(int k = i; k < length - 1 - i; ++k){ matrix[i][k] += (matrix[k][length - 1 - i] + matrix[length - 1 - i][length - 1 - k] + matrix[length - 1 - k][i]); matrix[k][length - 1 - i] = (matrix[i][k] - matrix[k][length - 1 - i] - matrix[length - 1 - i][length - 1 - k] - matrix[length - 1 - k][i]); matrix[length - 1 - i][length - 1 - k] = (matrix[i][k] - matrix[k][length - 1 - i] - matrix[length - 1 - i][length - 1 - k] - matrix[length - 1 - k][i]); matrix[length - 1 - k][i] = (matrix[i][k] - matrix[k][length - 1 - i] - matrix[length - 1 - i][length - 1 - k] - matrix[length - 1 - k][i]); matrix[i][k] = (matrix[i][k] - matrix[k][length - 1 - i] - matrix[length - 1 - i][length - 1 - k] - matrix[length - 1 - k][i]); } } }}
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