[leetcode] Rotate Image

要想仔细一点不要只想第一层

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public class Solution { public void rotate(int[][] matrix) { if (matrix == null || matrix.length <= 1 || matrix.length != matrix[0].length) return; int start = 0; int end = matrix.length-1; while (start < end){ for (int i = 0; i < (end-start); i++){ int temp = matrix[end-i][start]; matrix[end-i][start] = matrix[end][end-i]; matrix[end][end-i] = matrix[start+i][end]; matrix[start+i][end] = matrix[start][start+i]; matrix[start][start+i] = temp; } start++; end--; } } }