题目
给你一个 m 行 n 列的矩阵 matrix ，请按照 顺时针螺旋顺序 ，返回矩阵中的所有元素。
示例 1：
输入：matrix = [[1,2,3],[4,5,6],[7,8,9]]
输出：[1,2,3,6,9,8,7,4,5]
示例 2：
输入：matrix = [[1,2,3,4],[5,6,7,8],[9,10,11,12]]
输出：[1,2,3,4,8,12,11,10,9,5,6,7]
提示：
m == matrix.length
n == matrix[i].length
1 <= m, n <= 10
-100 <= matrix[i][j] <= 100
题解
class Solution {
public List<Integer> spiralOrder(int[][] matrix) {
List<Integer> order = new ArrayList<Integer>();
if (matrix == null || matrix.length == 0 || matrix[0].length == 0) {
return order;
}
int rows = matrix.length, columns = matrix[0].length;
boolean[][] visited = new boolean[rows][columns];
int total = rows * columns;
int row = 0, column = 0;
int[][] directions = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
int directionIndex = 0;
for (int i = 0; i < total; i++) {
order.add(matrix[row][column]);
visited[row][column] = true;
int nextRow = row + directions[directionIndex][0], nextColumn = column + directions[directionIndex][1];
if (nextRow < 0 || nextRow >= rows || nextColumn < 0 || nextColumn >= columns || visited[nextRow][nextColumn]) {
directionIndex = (directionIndex + 1) % 4;
}
row += directions[directionIndex][0];
column += directions[directionIndex][1];
}
return order;
}
}来自力扣官方题解