Java实现螺旋矩阵的示例

给定一个包含 m x n 个元素的矩阵(m 行, n 列),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:

[

[ 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:

[

[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]

class Solution {

public List<Integer> spiralOrder(int[][] matrix) {

List<Integer> result = new LinkedList<>();

if(matrix.length==0) return result;

int upBound = 0;

int rightBound = matrix[0].length-1;

int leftBound = 0;

int downBound = matrix.length-1;

while(true){

for(int i=leftBound; i<=rightBound; ++i)

result.add(matrix[upBound][i]);

if(++upBound>downBound) break;

for(int i=upBound; i<=downBound; ++i)

result.add(matrix[i][rightBound]);

if(--rightBound<leftBound) break;

for(int i=rightBound; i>=leftBound; --i)

result.add(matrix[downBound][i]);

if(--downBound<upBound) break;

for(int i=downBound; i>=upBound; --i)

result.add(matrix[i][leftBound]);

if(++leftBound>rightBound) break;

}

return result;

}

}

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