目录
一、题目内容
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
二、解题思路
确定上下左右的边界,然后按照螺旋的顺序进行存储,每完成一个方向的存储,就让边界进行加1或减1的变化;
如果左右或者上下边界重合,则说明遍历完毕;
三、代码
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class Solution:
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def spiralOrder(self, matrix: list) -> list:
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if len(matrix) == 0 or len(matrix[0]) == 0:
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return []
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res = []
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up = 0
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down = len(matrix) - 1
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left = 0
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right = len(matrix[0]) - 1
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while 1:
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for i in range(left, right + 1):
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res.append(matrix[up][i])
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up += 1
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if up > down:
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break
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for i in range(up, down + 1):
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res.append(matrix[i][right])
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right -= 1
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if right < left:
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break
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for i in range(right, left - 1, -1):
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res.append(matrix[down][i])
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down -= 1
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if down < up:
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break
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for i in range(down, up - 1, -1):
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res.append(matrix[i][left])
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left += 1
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if left > right:
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break
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return res
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if __name__ == '__main__':
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s = Solution()
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matrix = [[1, 2, 3, 4],
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[5, 6, 7, 8],
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[9, 10, 11, 12]
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]
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ans = s.spiralOrder(matrix)
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print(ans)
文章来源: nickhuang1996.blog.csdn.net,作者:悲恋花丶无心之人,版权归原作者所有,如需转载,请联系作者。
原文链接:nickhuang1996.blog.csdn.net/article/details/114819984