leetcode-48-旋转图像

题目描述：

leetcode-48-旋转图像

方法一：先转置再反转

class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        n = len(matrix)
        for i in range(n):
            for j in range(i,n):
                matrix[i][j],matrix[j][i] = matrix[j][i],matrix[i][j]
        
        for i in range(n):
            matrix[i].reverse()
            
        return

方法二：

matrix[:] = list(map(lambda x:list(x)[::-1], zip(*matrix)))

方法三：

class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        n = len(matrix[0]) 
        for i in range(n // 2 + n % 2): 
            for j in range(n // 2): 
                tmp = matrix[n - 1 - j][i] 
                matrix[n - 1 - j][i] = matrix[n - 1 - i][n - j - 1] 
                matrix[n - 1 - i][n - j - 1] = matrix[j][n - 1 -i] 
                matrix[j][n - 1 - i] = matrix[i][j] 
                matrix[i][j] = tmp