867. Transpose Matrix

Easy

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Given a 2D integer array matrix, return the transpose of matrix.

The transpose of a matrix is the matrix flipped over its main diagonal, switching the matrix's row and column indices.

Example 1:

Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]
Output: [[1,4,7],[2,5,8],[3,6,9]]

Example 2:

Input: matrix = [[1,2,3],[4,5,6]]
Output: [[1,4],[2,5],[3,6]]

Constraints:

• m == matrix.length

• n == matrix[i].length

• 1 <= m, n <= 1000

• 1 <= m * n <= 105

• -109 <= matrix[i][j] <= 109

class Solution:
    def transpose(self, matrix: List[List[int]]) -> List[List[int]]:
        m = [[0]*len(matrix) for _ in range(len(matrix[0]))]
        for i in range(len(matrix)):
            for j in range(len(matrix[0])):
                m[j][i] = matrix[i][j]
        return m